Best Digital SLR Camera to buy under $600? (camera + lense)?

Well i'm kind of counfused on what to get but i've seen the nikon d3100, n i'm not too sure about the price yet. ( i need to check stores) and i dnt want to go over $600 as its going to be my first dslr camera.
if the d3100 isn't way over my price limit ill go with it
but there's the nikon d3000 and d5000
and canon EOS XS,

what's the best to purchase from: nikon d3000, d5000, and canon EOS XS
any other recommendations?

If you can get it, the D3100 would be the best choice

currently it is $600 exactly and it comes with an 18-55mm lens. You will, however, have to spend an extra $50-100 in accessories