here's your one stop shop to get you into the 11's
http://atptrucks.com/category.sc?categoryId=39
twin turbo - 5200
suncoast IV - 2780
airdog 150 - 499
shim kit - 15
cognito braces - 216
spring clamps - 40
You've already got the exhaust and efilive so you're looking at a grand total of 8750 for parts to give you an 11 second truck. Rob even claims to have three years on this setup with a stock bottom end and no head studs. It seems like a no brainer to me. The truck you have is the equivalent of a 69 camaro. I don't think you'll be happy if you get rid of it. This is all just my .02
The MPI twins are a great product based on customer feedback.
However, I've personally seen 5 of the setups (or bigger) you just listed run before. Not one of them ran 11's, and this includes Rob's truck. One was even stuck in the 13's.
It would be like me promising that you could run 11's on a HTT or GT40 with a second CP3. Sure you COULD do it. But few have.
I'm still not convinced that twins by themselves create magic air. It's starting to look more and more like they obey normal physical laws.
You want to run 11's? Most reliable way so far is with either nitrous or a BIG single. That is GT42 or larger.