Im in agreement with seth & peng on this one,if i were you i'd go to my local "guitar center" store & buy a 300 watt or 400 watt amp,bring it home & test that puppy out,then if it made a difference keep it,if not take it back for a full no questions asked refund.
Im pretty well known at my local guitar center,i do this quite a bit but i do end up keeping alot of the gear.