TSP should NOT be considered budget headers. TSP know what they're doing from everything from heads to cams, and it's the same story with their headers.
I would stay away from OBX though. They're actually Chinese made and I've been told that they don't have the best fit. Of course I could be wrong since I've never actually bought a set. Anyway, TSP come from an amazing shop. Also, Big Flow headers are another pretty good alternative for those seeking to save a few bucks.