I just used butchers string. Worked fine.
Check out JSR Customs along your search. I had a set custom made for half the the price of what some charge for their regular production bars.
Do the bars yourself, easy enough, just gotta be patient. Also recommend changing the riser bushings as well to poly ones since you're going to have it apart any way. Also easy to do. I got Arlen Ness ones for like $10 or so. Makes the bars more solid.
"I'd rather have a bottle in front of me, than have to have a frontal lobotomy." ~ Tom Waits