Well I know a guy with a very similar setup as you running a Novi 1000 and 10lbs of boost and he dynoed 422rwhp. He is running 11.7@119mph at that hp on drag radials.
You have a great setup, and IMO the novi 1000 is probably the best choice for your combo. It is designed to put out a safe boost level 5-6psi (obviously you can increase or decrease your boost with any blower) and it's cheaper than the 2000, or the s-trim. It's sad to see a guy build a great car, and have it fly apart because of too much boost or too much nos. Go for the 1000