I've only tried the Rocketbladez on the range a few times, but was very impressed distance wise and for forgiveness, pal of mine plays with them, he swears by them, clubhousegolf have them for about £300 for a 4-pw.
When I started getting back into golf I was using my old mans 20 year old driver, steel shaft, steel head that was tiny compared to the modern day head sizes, had absolutely no confidence with my driver, put any power behind I'd balls up the drive, slow the swing down and I couldn't lift the ball as the loft was far too low, tried all sorts of different hand me down drivers before deciding to buy myself the Callaway X-Hot.....was just what I was needing, brought my confidence levels right up, was hitting it really well. Unfortunately I have to get rid of it, as my confidence has went up, so has my swing speed, it's a 11.5 loft driver, ballooning the ball in the air anytime I connect now.