this would be a basic stock replacement. steff (hurley97) uses this one on her 7afte setup, its ok.
http://cgi.ebay.com/ebaymotors/Bosch-Cobra...=item1e67692876it pumps ~ 5gpm or so. like i said, its ok, will work for your basic street driving, maybe a few drag runs, nothing crazy.
if you do alot of spirited driving, or track driving, somthing in the 15+GPM would be what you want, somthing like this meziere pump:
http://www.summitracing.com/parts/MEZ-WP136S/?rtype=10 that will pump 20GPM, and put the flow into "turbulent" flow thru the core, which is actually the best kind of flow for cooling
there are lots of diffrent brands of pumps, just do a little research on what you need for your useage VS cost.