What SLR should I upgrade to?

I currently have I nikon D60 with the stock lens (18-55mm) and 55-200mm lens both of which are VR. I'm wanting to upgrade to something bigger/better. I'm looking at spending 1500 or less but if it is a good deal I would pay more. I would also like to know what lenses I should buy to go with it. I take a wedding pictures, family pictures, senior pictures, and just random outdoor/nature pictures.

Added (1). By the way I think I have my Camera sold. So I can start with anything.

For those that don't have any lenses, the Canon digital cameras are the best out of any brand.

But if one already has money invested in Nikon lenses, then it would make sense to stick with a Nikon, so you can swap and use the same lenses.

I'm not a Nikon guy but as I understand it this camera is very similar to one that I own, the Rebel XS.
This then would be a fine camera. Unless you're looking for video why would you upgrade with this quality level of camera?

More over, to me, it would be a better idea to perhaps upgrade your lens situation. Or, if you're looking for video, perhaps buy your next unit, say the D3100, body only and add a lens with it.

I had my XS and wanted video so I bought my eos t1i body only since I already had my lenses.
Something to think about regarding "bang for your buck."

Get a Nikon D7000 as it is the best in it's class and better than any comparable canon in everything but video. The D7000 will also be easier to pick up as you have already been using a nikon and is a camera you will not grow out of. While 2 measly mpx less than the canon 60D or 7D it preforms better in low light and has better ergonomics. Also consider going for lenses as they are what allow you to do cool things with your composition and allow you to shoot in more difficult conditions…

Unless you are somehow being held back by burst rate/buffer speed, I think it's a waste of money to upgrade your camera (I see nothing wrong with the D60; it's relatively new).

Much better to spend the money on really good lenses or a good flash and battery pack.

If you take 'senior pictures' then I would hope you already know enough about cameras to make this decision yourself.