Those are some great numbers
I've driven and used many superchargers, KB, Whipple, Edelbrock, Vortech/Paxton and I must say Procharger is one of my favorites. I plan on getting a procharger for my vette eventually but I'm also a huge fan of nitrous so I think I want to have fun with that route for awhile.
Did you ever consider a meth kit? With a good meth kit you can run 10-12psi (if you're feelin' frisky) and make over 650whp on pump gas and be safe all day long! Even if you didn't want to go up in boost, meth acts like a safety feature in case you get a bad tank of gas, on a hot summer TX day, etc.