I am a recreational tennis player, I usually play only on open courts with my friends. I'm pretty good, though (for a recreational player ie) and a person who has actually played at the USTA level told that I might be around 3.0 level. I wanted to know which types of tennis balls should I use (I play on cemented hard courts). Right now we use Wilson Titanium balls which are readily available at Big-5 stores but they are only available in a can of 3. We are looking to buy balls in bulk, so any suggestions will be welcome. I live in the bay-area in California, where the temperature is usually hot and sunny and gets mildly cold during the night. We want balls that can be used for sometime -- like seven to eight sets, plus they should not be that light-weight too. Suggestions?