I bought a Callaway Big Bertha Warbird about 6 weeks ago. It was lying around in the back of the pro shop and I have never used a driver before, but asked the pro how much he wanted for it. He said £20 as it was a rusty old thing from about 1995. I tok it and hit it great right from the start. It;'s taken a couple shots off my game for sure and the length it added for me is amazing plus it's so much fun playing with this old antique and outdriving my playing partners.
Moral of the story, it doesn;t have to be the most expensive or amazing technology so long as you feel comfortable with it, golf has so much to do with confidence.