The snipers a really good bit of kit and looks a bit nicer as you don't need fuel rails etc. But it's also a lot more inefficient than a traditional port injection setup, it's designed for people with carburettors to quickly bolt on a high tech replacement, but it's not really a step up from port injection.
Is your VR a 4L60E though? If it is the sniper doesn't do transmission controls so you'll be a bit screwed.
If your car is auto you'll need a Pre VR Turbo 700, Turbo 350, Turbo 400 or a manual. Ånd you'll need a distributor thats compatible with the sniper (the factory bosch one won't be).
Proflow fuel rails set my car on fire last year (they are pretty poorly made), so I'd steer clear of anything proflow thats mission critical other than simple things. I'd spend the money and get a torque power or edelbrock manifold (I've got the edelbrock) and a fuelworks rail, the fuelworks rail was actually cheaper than the proflow.
Do you really need the sniper? I've got an efi hardware 4 barrel throttle body on mine, with an edelbrock dual plane running the factory ECU and a tune. Which is about 1/4 of the price than doing a sniper setup.