sony, canon, nikon, olympus, and pentax all make very nice, capable cameras
im not a fan of the entry level canons because of their feel.
what you need to do is go put your hands on everything you can and go from there.
im a very very big fan of the d40. ive been wanting to pick one up as a backup for a couple years.
target cleaered them out, you may still be able to find one there.
imo, the d40 is the best dslr at the budget level. but im biased towards nikon.
i also like pentax stuff a lot but have never owned any of their equipment.
the thing you get with canon and nikon is a vast amount of lenses and equipment that you dont see with the others just because canon and nikon or more popular.