Apathy

Ok, here comes a newbie question so please dont flame... I am fairly new to efi cars and I have been doing quite a bit to my 88 gxl lately... I am currently setting up a moderate NA/turbo... Well, whenever I talk to people at the tower, a gathering sort of like a car show/ place to set up races in fort lauderdale, some say get a S-AFC II and some say buy a Haltech... First after searching and reading on my own, I understand that a haltch is a complete fuel standalone system.... However, when I read about the S-AFC II it says that it allows for simple a/f adjustments w/ a few other nifty featurs... anyway, I just want to know what are the differences... And, if I am only building a 300hp car, which one should I order... I need to know, because I am almost done buying my parts and will start putting car back together in like 2 weeks. Thanx...