Do you have an intake fan and output fan at front and back of your rig?
IF so, and you really want a new decent hsf, then i'd recommend coolermaster, akasa or the arctic series..............but check those websites to ensure that the one you purchase is fit enough for your processor.
These sites will give you a list of what coolers can handle what processors.
Do a little homework.............it aint hard, and can actually be fun.