the greddy type r is available with normal or higher boost springs.

id go with tial, best quality out of all of them. just the feel and fit and finish is superb.

i run a first generation DSM blow off valve. its metal, holds up to 18psi fine, and for the price, nothing beats it for recirculating (which is how MAFs cars should be run). if it starts to leak, you can be ghetto and crush it, or do the 2nd port mod and it will hold whatever you wanna throw at it.