Kraftwerks! I have a brand new kwsc for sale in the classifieds, over 20% off mrsp. You can't beat that value per dollar for that, and its intercooled. Don't buy anything that isn't cooled if you plan to push your car or make more than 250hp reliably.
I am biased, I make over 390whp with my kraftwerks 8then SI, for two years making lots of power at 8600rpm skyhigh revs all day, with no problems.