Used HKS GT 60mm Wastegate with new diaphragm ($110) and spring setup for 1.2 bar. I have another spring for more boost (I think Titan was running 50 lbs on this previously). This has been the most reliable wastegate I have ever had experience with and has gone 4 years without a single problem. I'm going to a smaller wastegate as I might switch to single scroll to save some weight.
$450