I don't know any sample packs as such, but if I wanted to get that kind of sound, I'd get a rhodes soundfont, and write a nice jazz midi part for it. How good are your chords and stuff? Same for the guitar and bass.
Funk guitarists use flangers or wah- wah (modulated resonant bandpass) fairly often, so you could get a clean electric guitar and try adding those FX to make it funkier.
There are plenty of free soundfonts out there, and if you haven't got anything to play them yet, get plogue sfzorzando, it's good and free.