If money isn't an object, go for the Tyros. The keyboards have beem compared here over and over, but a few differences are:

3000: Better USB with thumb-drive cabability. Built-in speakers.
I'm sure there are some others advantages but I can't think of any.

Tyros: Better keys. Lighted buttons, huge color tilting display. Hard drive. More factory styles. More sounds. More polyphony. More sound memory. Aftertouch. Dedicated buttons for Vocal Harmony, Mic Settings, DSP on-off. Vocal Harmony on-off button. Mic adjustment on front. Three sounds available on right hand. Three assignable footswitch inputs. Assignable sub-outs.
Again, I'm sure I'm leaving some things off this list also.
DonM