The problem, as is with most performance shops (sorry guys)... is that even if the guy who owns or runs the place knows what he's doing, most of the time he will not be the one doing your work.

John Kauffman built me a motor personally many years ago... it was a beast for what it was and it lasted long enough given the circumstances. It's just a shame I was too inexperienced to know how badly it needed to be tuned. Shortly afterwards, a buddy had KMS do some work and it was not good... it had gone from a 1 man shop to a few and look what happened...

If I were in your shoes I would go with one of the more well known ports like you mentioned. can't argue with proven results and flow tested cnc ports.