no, it wont make any difference until a cuple o years when new titles will begin to stress your cpu more.
for now, i wouldnt bother in case you do something you regret.
on the other hand... if you got the 2500+ you would be able to overclock tothe same level as the 3200+ and beyond, for less money than you paid.
its an easy mistake, but sometimes the smaller number is the better option.
ask first and well bone you up on all the essential knowledge.
if you do decide to overclock, youll want to raise the fsb VERY SLOWLY and you may want to lower the cpu multiplier and ram timings if you experience problems.
remember, extra volts means more stability, but also more watts of heat. watts mean temp rise, means instability. if your cooling cant take the heat, extra juice will hinder more than help.
*lecture over*