Try the 'Near Topic' MINI Camera and Video. You'll get opinions on SLRs there
I'll put on a flame suit and give an opinion. Unless you are going up to Medium format the choice boils down Nikon or Canon. Pentax has some nice cameras, but Nikon and Canon have the R&D budgets to push the technologies. In photography there is no substitute for square inches

- size of sensor (film), size of image sites and maximum aperture of the lens. The technology of the digital SLR body is changing rapidly, so find the lenses you like, and then pick up the body that works with those lenses.
In keeping with the 'square inches' axiom, try to stay away from 'digital only' lenses since they limit you to a smaller image sensor. The exception to this rule is if you do get a body with a smaller sensor, and want a wide angle lens, the only affordable choice may be a digital only lens.