36 Nortech all the way. Best all around setup and perfromance. The only drawback is the width.
39 Dragon is very nice, super clean looking and well built. Talk to Tres, I believe he has run them. Craig is very cool to talk to also, he is the Zen Master of performance boats.
I haven't heard anything that great about the 37 GTX's. I think you might have a tough time getting rid of it once you've got it. They have that older single step bottom.