Check out the Seagate Cheetah's:

http://www.newegg.com/Product/Produc...82E16822148538

15k rpm with a 2ms latency which is quite good. I've never been a fan of seagate, but worth a try.

Alternatively you can try the new WD VelociRaptors (10k rpm), which are much improved over the old Raptor's from back in the day (which were, at their time, extremely fast).