you should choose your parts depending on how much power you want to start with, and how much you want to achieve later... there are the cheaper kits that will not be very good for making more power later, but if you're content with ~7 or 8 psi for a long time then go the cheap way and just get a rising rate fuel pressure regulator as your temporary fuel management and then when you want more power sell it on ebay and get something more substantial(upgraded injectors and a piggy back, rom tuen or stand alone system... go to this site >>
http://www.boostdesigns.comthey probably have the most cost effective kit on the market, because it comes with EVERYTHING... the greddy kit (with the intercooler) or any other kit with an intercooler and plumbing is quite expensive compared to the boost designs kit (haha free advertising here by me), and the quality is comparable. i've heard bad stories about every kit out there so it's kind of hit or miss any way you go. of course you're much more likely to "hit" if you listen to what people have to say about all the kits and choose accordingly.like wd said above even if you went with one of the more expensive kits like phat ka-t (but quality is through the roof), you will still not end up spending as much as the sr to make the horsepower you are probably aiming for ( i am guessing it's less than 350)... when you get into higher more extreme numbers and rebuilding the engines and all then the prices start to even out and the sr and ka start costing the same (i am talking about 500+ hp range) but until then you will most likely spend much less with the kat because you don't have to buy a $2000 engine and then upgrade everything on it. you start with the engine in hand and then just upgrade everything.... so roughly i'd say you stand to save at least $2000 by sticking with the ka turbo.