I've always used Canon SLRs, except for my first film camera, which was a Nikon.
CNET always has great review and here's a comparision:
http://reviews.cnet.com/4321-6501_7-6553204.html?tag=msAnd a buying guide:
http://reviews.cnet.com/4520-7603_7-6241014-1.html?tag=dirI had a Canon Digital Rebel for a couple years, but wanted more flexibility than the original model offered so I bought a Canon 30D about a year ago and absolutely love it!!
Plus, Canon has been top rated in the digital SLR world for quite awhile now... Plus, from what I've read, the XTi is a great low end digital SLR for the money that is incredibly user friendly.
However, that being said, make your decision based upon what features you need and want, and which camera will get you most or all of those for the price.
Also, realize that with a digital SLR you will also need a good photo editing program. I have used Adobe Photoshop Elements for years, but just recently got Adobe Photoshop CS3... HOLY CRAP!! What a world of difference!!
The only advice I can offer (because everyone will have their own opinion on which is better) is to get either
Canon or Nikon. Both will offer great flexibility when it comes to lenses and accessories!