Doh, my apologies, I read "stronger on upright" and thought you were looking for a doghouse piece.
Bromberg does a LOT of electric work too, but it seems to move between the "widdly-widdly" and the smooth jazz. He's got a KILLER arrangement of "September" off of "You Know That Feeling" though, and his originals "Hero" and "Joe Cool" are pretty good too.
If you're not looking for stuff in the Jaco vein (I'm a big fan of Havona or Come On, Come Over m'self... *shrug*), maybe you could look into finding old-time soul tunes (think Bill Withers or The Drifters, etc) with a simple melody, make it needlessly complicated by learning the melody via harmonics on the D and G strings, and figure out how to put sparse bass movement down via the E and A? Tunes that might work for that (you'd have to fiddle with the keys though to get the melody to 'lay' right on the harmonics) would be "Use Me", "Under The Boardwalk", "Ain't No Sunshine", etc.
