Quadro FX4500 released
A few days old now, but the latest professional offering from nVidia is the Quadro FX4500:-
It'll probably set you back £2,000 (£x,xxx, my sterling>US dollar conversion is crap), double it for SLI. Still, if you had 15k to spend solely on a jack-of-all-trades comp...
AMD X2 4400+ Toledo 1MB/Asus A8N-SLI Deluxe/2GB Kingston HyperX/SLI Gigabyte 7800 GTX 256MB/Creative SB Audigy 2 ZS Plat w/ Creative Inspire 6.1 speakers /180GB Hitachi PATA/19\" AG Neovo F-419 LCD/OCZ PowerStream 600W PSU/WinXP Home SP2