I am a big fan of my SGM .29. May not be a lot f or 15.00 but they really are the best. Especially with a high powered sniper rifle replica. If I am not using those, its usually Goldenball .32 or heavier for accuracy. I have yet to shoot with Biovals, but I hear good things about them....must be good since they are usually all sold out in most places.
Of course that will all be changing soon since the field will only allow bio bbs.