The best digital camera with swappable lenses right now is the Nikon D700. It performs better at IS06400 than most DSLRs do at ISO1600. It plus a Nikkor 35mm F/2, 50mm F/1.8 and 85mm F/1.8 will do 99% of what most photographers need. At least until one becomes afflicted by the terrible urge to photograph birds.
The Canon 5D Mk II is also very good, but it does't have the insane high ISO performance of the D700. Canon does make a nicer assortment of lenses, if you get past the steep prices. The EF 35mm F/1.4L, 85mm F/1.2L and 135mm F/2L are three of the best prime lenses made for 35mm, period. The new 24mm F/1.4L appears to be no slouch, either.
If you're seriously in the market for a DSLR, I suggest reading Ken Rockwell's page. He's nut, but his reviews aren't influenced by anyone's marketing department. I also suggest reading The Online Photographer. Mike is probably the best photography writer on the web. He's less technical than K-Rock, but his snark and eloquence invariably make for great reading. I'd avoid DPReview for most things, they're not owned by Amazon, and are usually the photographic equivalent of Stereophile.