I'll throw my 2 cents in:
Advantage makes a very nice 30' that will run upper 70s, low 80s with twin 496s. It is by far the roomiest 30' boat you can buy. My 27 has a lot more cockpit/cabin room than a lot of 29s and 30s that I've been in. Other good possibilities are Lavey as mentioned and Shockwave also builds a very big 29.