I'm not telling you what to buy just how to think through your needs. Look at the lens first in terms of exposure and focal length requirements. Have some one help you with the math if you don't know how. Pick out a lens or two and do consider used lenses. Lenses last nearly forever and the technology is not moving very fast. camera bodies on the other hand are a moving target and become obsolete quickly. So look at the market for used optics brfore yu pick a brand. Mostly you will find Canon and Nikon being offered. I would recommend a body that can take advanage of good used optics if you discover you need a big, expensive lenses (hint, $600 will buy a nice Nikon 80-200mm f/2.8 zoom)
Thanks for the input, Chris. Part of the problem is that I do not know enough to ask those questions. It makes it very hard for me to know if I am buying the right camera/lens system as well as making it very hard for you guys to help me out. I do not have anyone that I know personally to ask these questions of, so you guys here are my support.
As far as used goes, I do not know what to look for to make sure I am not getting something with problems or not, so as a result I am looking new. It looks like B&H has a few used cameras and I wish I could still get a D50 as that one seems perfect for me with a large sensor and AF so I can use almost any Nikon lens. B&H has one for $399 so that may be an option. The D80 is still around, but a little more than I think I should spend.
That does leave the XT/XTi which would both fit my needs nicely, and the lenses I see myself getting are readily available. Either Canon or Nikon have everything that I could imaging needing, so I think I will stay with either of those two.
I guess it comes down to personal preference at this point and everyone will have a point to make as to why either of them are better, but in the end I feel that I could not really go wrong with either company.
I am leaning towards grabbing that D50 now, but if anyone has a reason to NOT buy it, please let me know - and other options are welcome also of course.
Thanks again.