There is already some good advice in this thread, but I will add a couple of thoughts.
1. Decide what kind of budget you have for balls (sounds like you already have).
2. Decide what are the most important attributes for the ball you want (meter speed, spin, distance, durability, etc).
3. Spend some time in the Pro Shop or with the Pro Shop tables (http://www.wgt.com/forums/p/235590/3635884.aspx) to find one or more balls that will fit your budget, and favor your important attributes. Remember that more expensive does not necessarily mean they will be better for your style.
4. If you find a couple of balls that seem to fit, maybe play a few rounds with each to get a feel, so you can narrow down your selection.
5. Map the ball for all types of conditions with the clubs you are playing. In other words, spend a lot of time (and balls!) in practice (with minimal wind, etc), from the tee and from a typical fairway, to determine the actual distance of carry for each club and each type of shot. Do this with at least zero backspin and full backspin to get the limits for each club. As noted before, your wedges may surprise you when you hit a ball with a decent spin attribute. I am still working on that - sometimes I have backed a ball completely off a green! You may want to map a bit for the different lies of rough, brush, fescue, bunker, etc., if you visit them as much as I do (not as much as in the past!)
Those first steps are important because you don't want to have to repeat the mapping process very often!
FWIW - I switched from cheap balls to the Cally Soft Chrome (L43) a while back and they work well for me. But pick the ones that work for you.