Even if you have to save up for it, it's better to spend the money on a good one than save a buck or two and get cheap parts. The Professional Products ones like to come apart when you least expect them too. Seen a few already, and at rpms well below the sfi threshold. Like markdunlap said, ATI, Fluidampr, and TCI Rattler are all good ones. I run the Rattler myself, but that's just preference. ATI's rep speaks for itself, as does Fluidampr.