hey guys, i just had some questions for you concerning a dslr camera. im new to this site and new to using a dslr camera. ive been looking at the nikon d80 as well as the canon xti. ive looked everywhere on reviews and whatnot and see that the nikon d80 seems far superior than canon. i currently have a canon powershot A620 digital camera. i'll mainly use the dslr camera for nature shots, vacations, etc. i just wanted to know which one would be best. also with the nikon, what lenses would be the best? ive seen kits with nikkor, sigma and tamron lenses, all 28-80mm and 70-300mm lenses. ive looked at reviews for the lenses as well and it seems you can go either way with all of them.

any feedback will be much appreciated.
thanks!