I can't add much about the Nikon since I'm a Canon user. (Though I've plenty of positive stuff about that camera.)
As far as how the differences between the XTi and the 30D shake out, it depends a lot on your personal preferences and your subjects. (Disclaimer: I own neither of these two cameras. I do own a 350D/XT and a 5D - the former is similar to the XTi and the latter is in many ways similar to the 30D.)
If you are budget limited, the XTi could well be the better choice. It is capable of producing image quality that, at worst, is indistinguishable from that of the 30D and arguably might be a little bit better. It actually incorporates many of the features of the 30D (such as the AF system) at a lower price, and adds some additional features not found on the 30D (10MP sensor, dust reduction, etc.).
The 30D is larger and heavier and, therefore, looks more "pro" to many buyers. Some like the handling of the larger body, while others like the smaller body for the same reasons. I have large hands and I have happily used the 350D/XT for the past two years and I virtually never am bothered by the body size.
Some say that the interface on the 30D is far better than that on the XTi. Based on my experience with the 350D/XT and the 5D, I'll agree that the interfaces are a bit different. However, after learning my 350D fully I could operate it quickly and intuitively and, frankly, I don't find the 5D interface profoundly better - at it is virtually the same as the 30D.
The 30D does have some features that may put it ahead of the XTi if you need them. Like the 5D, the maximum burst rate of the XTi is 3 fps. The 30D can do 5 fps. If you often require this for action photography then the difference can be worth it. The 30D also provides spot metering. Again, if you are a big spot metering fan this might make a difference. (Most photographers today don't rely on spot metering - the histogram often tells you more, and quickly.)
Another possible advantage of the XTi is that, costing less, you may have a bit more money left over to spend on better lenses. In the end I think that the quality of your images is more likely to be affected by better lenses than by any difference between these two bodies.
Take care,
Dan
Thanks for all of your replies/info your viewpoints were very informative. So I have done some research and narowed my decision down. I am interested in any feedback about the Rebel XTI vs 30D or D200 (I did have a price range after all LOL) Primarily will be used for portraits/event photog.
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