Exactly.

ALso on the edelbrock kit, that will get you the power you want but will cost a bit more and in the end you will start replacing parts on it to try and make more power. Out of the box yes you can bump the boost up a bit and it is "pre tuned" for up to 12 psi I believe (dont quote me).
Go here for ANYTHING you may want to find out.. just page through every section and youll quickly get up to speed. Turbo D16 • Index page

Now if you wanted to start putting your own kit together it can be cheaper, mostly if you have patience and don't just buy the first thing you see. For instance I waited a little bit and I got my tial 38mm WG for 80 bucks, my turbo for 75 (it might have blown seals...ill need to inspect better if I buy another turbo) and a stainless steel tubular log manifold for 160 shipped (very good deal). Tuning is going to be the expensive part unless you just get your ecu chipped and then take it to a tuner. My Hondata S300 ran me about 610 installed in a p28 and shipped, which is still about 150 off the lowest youll find it but its not cheap.