my $0.02
Tony,
Everyone is bound to have a differing opinion on what sounds best, but many of the modern synths can pull of very nice sounds, including: wurly, rhodes, clav, organs, etc...
Personally, I settled on
the Yamaha Motif. This is a board with some growing room, including the ability to store up to 128 user voices, plus a bunch of user-drums (and arpegios, etc.) so you can customize voices, create your own from the built-in waves, or sample your own waves. You should prioritize what you want from a synth, and use that to help you narrow the suspects -- things you may want on the list could include:
sounds (overall, and specific sounds too)
keyboard action (prefer synth or piano? want after-touch?)
price is a factor for some people
expandability, cutomizability
vendor/manufacturer support
etc...
Speaking of support, I've been blown away by the support Yamaha has put into the Motif. They are releaseing free voicebanks, and such, as well as releaseing a 2-hour DVD to help compensate for the lacking manual....