There are several blowers out there and most are quality products. You first have to decide whether you want to use a centrifugal blower (like Procharger or Paxton) or a roots type blower (like KB and Maggie).
Second, you have to realize your limitations with a stock LS7 engine. It has an 11.5:1 compression ratio amd non forged pistons. That means that boost, either from a blower or a nitrous kit, must be very tame.
There are several threads on this subject in the power adders sections so I will only hit the highlights....
If you do not want to lower your compression by porting out the combustion chamber of your heads, replacing oem pistons with dished or even using a thicker head gasket, then the amount of boost you run should probably remain under 6 lbs. If you install a meth kit, you can probably run the boost just a little higher.
If I were going to modify my C6Z, I would probably just throw on a Procharger P1-SC and run about 4.5 to 5 lbs boost. Except for injectors and a tune, additional modifications are not required.
The first C6Z that I saw MC Racing do that to, went to the track the day he got it back and ran a 10.8 on his first pass.
The setup I described above is very safe and should run around town like a stock set-up...until the extra power is needed.
If you want to go for bigger power, then some engine modifications are required...but that's a whole different subject.
Mike
... she should have about 525rwhp by then... that should hold me over until the next body style comes out... which is when? 2011? 3 years is perfect... I'll get the C7 coupe and then I'll go nuts with twin turbo chargers / cam / heads / etc... (if I can't afford a Murcielago yet ;-)) Thanks again... 
Good luck!
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