Right now the Canon 1DS and the Contax are the best pro-digitals I hear. They are very expensive and require investments at or around $ 10-12,000 with lenses etc.
The Canon 1DSW is only 4 million megapixels too.
I think the best digital SLR's will be affordable in 3-5 years. Until then the pro-sumer market can only bear the Rebel and D-70. The Panasonic?Leica really does not have any competition in it's price range or even 2-3x it's price. You go from $ 600.00 to well over $6,000 to see much better performance. I read today where most British and german photo-journalists are going this route.
Don't throw your 35mm cameras away just yet. My Nikon N8008 with Kodaks High-Resolution film and developed by Kodak is still better than any digital SLR out there. I just get the film developed and add in a CD so I can do further editing. But My Pana/leica is fast becoming my favorite.