What would be responsible price?

I'm thinking to sell my Sony A230, with 2 lenses ( 18-55mm and 70-300mm ) case for camera and 8GB memory card. Don't know what would be responsible price to ask, don't want to give it away for free, but don't want to ask too much.help?
Thinking to upgrade to Nikon D90 - Maybe here is someone who owns one, and can share experience.

Thanks

Added (1). Basically reason for upgrading is that my Sony broke down twice already, with the same problem:/ that's why i wanted to try something else.

How to Click Night Photographs on my Nikon D90?

I recently brought a Nikon D90 and am not too familiar with the Camera myself. But am learning different settings and trying different stunts. I would love to know how to click Photographs at night. What settings is best suited for night photographs with lots of lights and lit up Building? Appreciate your detailed feedback and valuable answers.

Best canon lens option?

I'm about to buy a 60D. Before I had a D40 Nikon with 18-55mm and lately I've been using a EOS 3000 N (film) with a 28-90mm. It took me a while to decide for the 60D but now I need help deciding which lens. Among my picks top are:
18-55mm + 55-250mm
18-135mm (maybe after a few months i could get a 50mm prime)
18-200mm
I know the lower the zoom range the better the image quality its supposed to be, but how bad is the lens quality on the super zooms? Obviously having a lens with a wider zoom range is more handy than changing between lenses. Is there a big difference between the image quality of the 18-135mm an the 18-200mm? I wouldn't mind spending an extra buck if the 18-200mm has a better quality than the 18-135mm, and the extra zoom is not really necessary but it would sure be nice to have it. I will be taking all kinds of pictures.
PD: All of the lenses I'm considering are IS and EF-S
PD: Any insight is welcomed, including other lens options.

Exposure parameters in nikon d40?

I have a question for you, since I control the main exposure parameters in manual mode (stutter speed, aperture and ISO) what is the exact use of the exposure compensation? (EV)
In other words when must I use the EV and when use (stutter speed, aperture and ISO)? Or must use both?
I'm confused

I really look forward to hearing back from you.

Regards

Ibrahim Shalaby

Added (1). Of coarse I meant shutter speed not "stutter"
Sorry for the typing mistake

Would a Nikon 50mm f/1.8 D coupled with a D90 be a good combo?

I have a Nikon D90 with the 18-105mm VR and I'm planning to buy the Nikkor 50mm f/1.8 D. Somebody told me not to go for it saying that the 18-105mm already has 50mm in between so i shouldn't spend the extra money. However several other people told me to get it saying it would yield great shots. What is the benefit/are the benefits of having this lens(Nikon 50mm f/1.8 D) and the kind of pictures i would be able to take with it.

Could I make a 28-300mm 3.5-6.3 lens work for night football photography?

I can't really afford a fancy 2.8 lens right now but I can afford this lens I mentioned. I'm looking for something to use besides my 18-105mm standard lens that came with my Nikon D90 to shoot night football. The field is dimly lit with stadium lights & I have already shot with the 18-105mm lens I have but didn't get great results. What settings would be ideal when using a 28-300mm 3.5-6.3 lens? Could I somehow get decent shots with this lens?

Can the MB-18 be used on a Nikon N60?

I recently bought an N60 (film, not D60), and while looking for a grip came across the MB-18.It is marketed for the 70-75 series, but apparently can work with the N55. Does the same apply for the N60?

Nikon D3000 help? Just bought a Rokinon Digital 8mm F/3.5 Aspherical Fisheye Lens for it?

I have set everything to manual, raised the ISO setting, yet my pictures are still coming out dark and splotchy. You can't see anything. Also, I'm unable to zoom in and out with the focus ring. Please help, I'm fairly new to all of this, really was looking forward to getting a new lens for my camera, and now, it doesn't work. :'(

Added (1). Also, how come the flash is unable to release when using this lens? Even when I attach my new flash onto my camera with it it says the flash is in T.something mode, and that I need to change it's settings. What should I do. Sorry if I sound like an idiot, still trying to figure all this out.

How to enhance my photography skills?

I was wondering how a beginner photographer could enhance is knowledge on photography. One of the things that I would want to do I read up on a good book that talks about the functions of the buttons on my camera and what it does. So could anyone recommend a book?
Secondly, what are some things to keep in mind? Like how to hold the camera and that kind of stuff. Tips on photography and what to remember when taking pictures.

Oh and if you would like to know I own a Nikon D90 with a 18-55mm lens.

Where to buy a reasonable priced Fisheye lens for a Nikon DSLR?

I've searched tons of places, mainly amazon, for a reasonably priced Fisheye lens for my Nikon D5000, and I can't seem to find a good one that isn't much money.
I don't have a lot of money for this and I know the cheapest ones are called "wide angle lens". Which actually don't end up being much of a Fisheye, but does anyone know of anywhere where I can find one for a low price?