What Nikon Camera fits my wants?

Well i'm debating whether i should get wither Nikon D5000, Nikon D3100, or Nikon D5100. But the problem is that i'm in a tight budget so i have to fit wisely cause the Nikon D5000 is good and all but super expensive at $800. And that's ALOT! I want a camera for Architectural Photography and Landscape and all and i want something super good that has a super HD feel. Since i don't know much about Cameras i don't know which one fits my needs and which one has things i wouldnt need that much. For any of you pro photographers out there that know about these cameras, Please help me pick any of these two (Nikon D5000 & D3100) that are similar as the Nikon D5100! Please list the positives and Negatives, Thanks very much: P

I wouldn't go for the d5000 since the d5100 is an update from it and and it's really really nice for beginners. I just went in the store today to test it out. It was so amazing! I couldn't believe the image quality of the d5100. I will definitely recommend that.
But since you are shooting landscapes and architectural photos, I'm guessing you're going to be outside a lot?

The guy said that cameras in general do not work well in damp weather as the moisture in the air will go into it. But I'm not sure, I'm still doing more research.

If you are going to invest in a camera, and thinking about going pro in the future maybe get a d7000?
I know Nikon has a lot of sales/deals/packages going around. I suggest you look online or in store. Some kits sometimes come with two lens that will come in handy for shooting in distance!
But anyways, all of them are nice cameras. It really depends if your going to go pro and the price.
I know the price on the cameras are crazy!
Wait until spring. Nikon is coming out with a new camera but it's the pro ones. Sometimes they lower the price of lower models.

Hope I helped.

Out of the ones you suggest the D5100 is by far the best - I buy my photographic gear from Citiwide Hongkong (which suits me in Australia but perhaps not you) and the price for body only is below US$600 delivered