The V6 is cheaper, better on gas and would be less to insure. Not sure how much less, that depends on YOU.
The V6 has 300hp which by no means is slow. With a supercharger or turbo, you'll be up around V8 power...we've heard that SC and Turbo kits are in the works, but they're not readily available yet and when they are, expect to pay over $5-6,000+ for one (if not $7-8,000). AND, don't expect to have a drivetrain warranty once you've installed a SC or Turbo.
SO, this really all comes down to your preference and your wallet.
ECS-Paxton Supercharger / American Racing Headers & Exhaust / PFADT Suspension / DSS 9" 4.10 Rear / FOR SALE!
Powerfreak is the only one who actually understood anything.