Well definately stay away from Powerdyne... they are CRAP. If you are tight on money I don't suggest getting a blower because you need to do things right. You will need (should) upgradeyour fuel pump in addition to the T-rex that comes with it, install an aftermarket ignition, fuel pressure regulator, and upgrade your injectors 30# (6psi) or 36# (10+psi) and MAF.
If you STILL want to put a blower on, then buy a Vortech A-trim which runs about 6psi. Put on a aftermarket powerpipe (stock tubing is what we call a pancake elbow) to increase boost to 9-10psi.
I had a blower (A-trim) on my car with the stock pump and my rings wore within a couple of years and I was blowing head gaskets. My T-rex crapped out on my too. After builing my motor and upgrading to an S-trim (11psi) I had to buy a fuel system, 30# injectors (shouldhave bougth 36's), and a Walboro 255lph intank pump. I had some serious tuning issues so I bought a chip which forced me to get an ignition (MSD 6AL) and found out my BTM had been dead all along so I bought a new one. I still have serious tuning issues and I am running a tad bit faster in the 1/4 than with the a-trim and stock motor.
So take my advise, get ALL the necessary equipment before you get a blower, or you'll be out a lot of money. ie head gaskets (1 or multiple) or new motor
