With the prices of tax stamps, I buy the best suppressor I can afford. Yes, I can build a decent one for a mere fraction of the cost, but I want the best performance if I'm paying an extra $200 per.

You can always build your own and ignore getting a stamp, but you seemed to be concerned with following the law. Paying $200 for a stamp and then building a less than pro-level suppressor just seems ... a waste.