Honestly the situation your in is a good one. You are currently stuck in a "Win Win" situation. I've had my IPS kit for 2.5 years and 25,XXX miles and I love it. The kit had some things missing when I got it because I was one of the first but they rectified the situation without any conflict and even overnighted the lines to me. But what I would like to tell you is to go for the full blown version. The reason I say this is because you mentioned building it down the road. I went the same route and I tell you this from experience in a car this heavy when you put down $7000+ dollars to build an engine you are not going to be satisfied with 50 or so more horsepower.
Futral Motorsports built and tuned