I've seen the TRD S/C in person at Scion Night (pics), but the guy there (from TRD?) didn't have the keys, so we couldn't hear or see it in action.
They're just waiting to get approval & should be ready for SEMA
My guess would be - nothing would be able to beat TRD.
TRD might have less power than other kits, but it would be priced right and warranted. Blitz kits are usually way higher than $3K, and there are not many others that are worth a look. And if you don't care about warranty - go with a turbo. At least you'll get a chance to learn how to fix it very soon