D,
In my experience as a long drive guy, it is all about the shaft. You will see the most difference in having the right shaft vs. the right head. I can look at your #s and recommend something (clubhead speed, launch angle, ball speed, ball spin). You can just go to Golfsmith and ask for a printout, or just write down your #s after each swing for 5-10 swings.
I also am connected to a bunch of long drive guys, so I can usually find deals on shafts.... including stiff and x-stiff shafts (not just the xx and xxx shafts that I play). For example, I bought 3 new Accuflex Extreme LD shafts a while back for like $90. They retailed at well over $100 each not too long ago. I also know a couple club makers that can recommend the best couple of shafts based on your launch monitor numbers.
I want to get a couple of new driver heads myself. I'll probably go with a Krank El Diablo, TM Burner, and/or Adams A4. I've replaced my whole bag, minus the driver, since November: Mizuno MP-52s, Odyssey Marxman, TM Z-Groove 54* and 58* wedges, Adams Idea Pro 2 hybrid, Cleveland 3 iron (driving iron), and an Alpha 3 wood. You were right about the Mizunos & Project X shafts. I hit some absolutely money shots during my 1st round with them. Birdied 4 of the last 6 to shoot 71 in a heavy wind at Memorial. I am thinking about putting some Rifle Spinner shafts on my wedges.
Let me know when you want to play.