I was wondering if there is a decent tuner available for a 1996 5.0/5.8 vortec engine?

I dont want some goofy contraption that lets you select between a handful of predetermined tunes.

Id prefer a device that allows you to see on a laptop real time data and the ability to make real changes to the fuel and spark tables.

I know some engine computers have this support, many do not, I tried a search but came up with nothing.

I understand megasquirt offers this option but Id like options on something a little more complete, preferably a unit that offers a default that sets everything back to stock, should changes made royaly screw things up.

Thanks