Personally I think MS has pretty baller software available:
Megatune realtime tuning-
Fuel
http://i7.tinypic.com/6tmuliw.png
Boost Duty Cycle
http://i15.tinypic.com/6od3mys.png
Megatunix, replaces megatune.
http://download.freshmeat.net/screenshots/51533.png

but aem fic would be good and megasquirt is better...and it really seems that the aem standalone is neither overpriced for what it can really do!!! but megasquirt has my vote!!!

however, two pc pros ownz all. one to control the 4 injectors, another to control the intercooler, how awesome.

whats the difference between megatunix and megatune?

Megatune has autotune and runs in windows.
Megatunix was designed for a unix operating system but can be run in windows. It does not have a autotune function but it has fully customizable gauge layouts and designs as well as way cooler 3D graphs for real time tuning.

Good video to get the idea.
http://www.youtube.com/watch?v=HQZLL5VXZ6U