Luvphillyman,
I get into "Tell Me Something Good" too. It's one of the few secular songs that I can play and sing simultaneously.
Still, my favorite secular basslines are "Let's Work" by Prince (who is a VERY accomplished bassist) and "Strawberry Letter 23" where Louis Johnson just lights it up. I have the studio version, a live version (totally off the hook) and a live version with Larry Graham playing in with the Brothers Johnson.
My favorite gospel lines (so far) are "I Want My Destiny" and "Let Me Praise You Now", both off Fred Hammond's "Purpose By Design" cd and Terrance Palmer playing with Isreal & The New Breed on "Who Is Like The Lord"
Peace,
James