Thought I'd ad my 2 cents to this. I currently use the Callaway Legend ball at 300 credits. I find that the Nike ball has a bit too much spin for my liking and I don't sacrifice much in the distance department. I realize that this isn't much help if you aren't a Legend but the Callaway ball that you can buy is pretty good as well.
And please remember, that free advice is worth exactly what you pay for it... LOL