That is up to you to see what's comfortable. And now that I think about it I'm not even sure what degree mine are. I know they are 28" with 4" pullback, kinda wish I had 32" but couldn't pass up the price of the ones I have.
I have 28in bars with a 4in pull back and i love them, you really cant go any shorter than 28 or you will have issues with your bars hitting the tank unless you go higher than the stock risers. I got myset off of ebay, they are black with the dimples for the wires. Let me know if you have anyother questions i will be more than happy to help.