5b2m, first, you need to evaluate your ball flight with your current driver. Are you hitting it too high or too low with your current loft? Also, what shaft flex have you been using? It would really be great if you could get into a launch monitor with your current driver and as sonoma9600 says, obtain your current launch angle and spin rate. In particular, the launch angle will give you the best indication of what loft you should be looking at.
As a general rule, most golfers with your higher swing speed will be better off with a 9 or 9.5 degree loft on their driver. However, the reason we make the 8 degree is for those golfers who still hit it too high. Another rule of thumb that is very general is that the higher swing speed players do far better with the lower lofts and the slow swingers and those that have lost distance from increasing age do better with the higher lofts of 10, 10.5 and even 11 degree lofts. This is why many women players do the best with lofts from 12 degrees to as much as 15 degrees with their drivers.
If I used so called averages, I would guess that in 9 out of 10 cases, the 9 or 9.5 degree loft will work better for someone with your swing speed. So, this is where you really need to evaluate yourself and hopefully get some launch monitor numbers to support your decision.
