hptuners all the way. I'm always tinkering with things, learning new tricks, and just tryin to help others out too on the hptuners forum. I only got the normal MPVI interface since I don't really have the use for the EIO yet, once I turbo I might goto the EIO, but for now I can still log AFR with the wideband I'm going to be ordering soon (plx devices sm-afr with a MD-100). learning how to tune and how everything work will benefit you. if you get good at tuning, you can even tune your buddy's truck for 200 bux or so and make back a third of what you spent on the software.

with the support of people like foff, 5liter eater, and russkemp from the hptuners board it makes tuning a breeze.