I had the Magnuson on for about two years. Really nice street blower and fun at the strip. Of course I want more power, higer trap speeds and lower ets so I now have a procharger f1a on a inertia built 370.
I'd say it depends what you want to do with the car.
Procharger has a spectrum of products from entry level to the monster rob goss uses to run a 7.07 quarter mile at 203mph!
Magnuson has the 2300 and I know folks that run 6 to 14 lbs of boost.
Kenne bell also has a range of options in terms of displacement as well.
Call josh at high horse performance and talk over your options.