What shaft should I go with?

I have a TaylorMade R5 N driver at 8.5 degrees loft. I have the stock stiff shaft in it right now. My swing speed is 116-120 mph, and I need an X shaft for certain. I am having trouble deciding what shaft I should go with. I have tried the Grafalloy Blue and did not like it. I prefer a mid-high launch angle. If you are a good golfer (8 handicap or lower), and you have some experience with shafts, please give any advice!!