The best digital SLR at amateur level would be the Nikon D200, as reviewed here on Steves Digicams: http://www.steves-digicams.com/2006_reviews/d200.html
yours for the bargain price of £830 - £1,800 depending on where you get it from.
The best PRO digital SLR appears to be another Nikon, the D2X
http://www.steves-digicams.com/2005_reviews/d2x.html
Yours for between £1,100 - £2,799
The Fuji S3 Pro wasn't bad either, but they've had to drop it from their range thanks to the E.U. (something to do with Mercury in the circuit boards)
http://www.steves-digicams.com/2005_reviews/s3pro.html
Apparently the Canon EOS-1Ds Mark II (£4500) & Canon EOS 5D aren't bad either
http://www.steves-digicams.com/2005_reviews/1dsm2.html
http://www.steves-digicams.com/2005_reviews/5d.html