I gained 50whp/50tq with a full exhaust and cold air intake, and trapped 120mph before getting a tune. I know that my Boss is quicker on the street to 100mph (vs stock C6Z), no doubts. There is no loss in 'fun factor' going from a C6Z to a Boss (with a few minor bolt-ons to bring out some powa). I also felt the same way about my Shelby (except the horrible 1-2 grind, which is why i sold it), loved my Shelby just as much as my Z, and just as fun to drive.
In the end, life is too short to love one car. If the OP doesnt love his new Boss then he can always go back to 'another' Z06. For me, it was either buy my 3rd Z06 or buy a new Boss, easy decision.
not to change topics, but do you loose the side exits with a aftermarket exhaust?