Need some help with drivers

I am a new golfer, but learning very quickly. Irons are the highlight of my game.  Always used dads old driver.  A 440cc nichlaus airmax with a 10.5 degree loft an offset clubface, and a regular flexed shaft.  Come to find that a 10.5 degree loft is good for me, even though i swing very fast. Clubhead spead is around 106 averaged. I know I should be using a 9.5 degree but like I said, my irons are good, so I come down pretty steep on the ball.  The nichlaus airmax broke away from the shaft today.  No big deal, I swing too hard for the shaft anyway.

Heres the problem.  Today I went to Golf Galaxy and hit a few different drivers and landed on a ping i20 with 10.5 degree loft and a project X 6.0 shaft on it.  I mean, no matter what I did, the thing wanted to go straight for me.  So heres where it gets sticky.  The thing costs $200.  Now money is no issue.  I really have no problem spending that, or more, if it will get me to hit the ball somewhat straight all the time.  But I got to wondering.  Was my old club really a good club with a shaft that wasnt right for me?  Is it worth replacing the old shaft with oh say a rifle project X 6.0. Maybe I can have the same club as the ping, and spend a lot less money.

Another question is that I have never been fit for a driver before, is this worth doing if I have found a ping in the used bin that I hit straight anyway?

The Nicklaus Airmax driver was a Golf Digest Hotlist club in 2005.

On reshaft: A Project X 6.0 Graphite Wood shaft will cost you about $150, plus the cost of installation and a grip. So, the i20 driver would probably be a better value, if that's the best shaft and head combination for you.

Also, don't assume that just because you have a 100 + mph clubhead speed that 9.5* is what you need for driver loft. Take a look at pro Lee Westwood's 11* driver and why he uses it:

http://www.golfdigest.com/golf-equipment/whats-in-my-bag/2010-03/lee-westwood-my-golfbag

Loft and shaft characteristics work together, with the ball you use, to launch the ball. A fitting would help you find the best loft-shaft combination for what you want to do. An i20 with 10.5* and PX 6.0 might well be in the mix.

Also, driver fittings give you good data on the nature of your swing. Then, related fittings for FWs and irons will help you fine-tune your set.