keep an eye on the Terminator X Stealth, a view more goodies if you want more in the future like nitrous control, drag racing, ac and blower control. Just 500 bucks more. Less EMI sensitive with the external Ecu.
Sniper has provisions for A/C kick and electric fans through the ECU.
IMO, Terminator more of a "custom" install type deal. Those systems seem to be geared more towards ricky racer types that have a bunch of sensors on the car and are trying to control nitrous/boost/timing retard etc. Totally different ball 'o wax than a Sniper which is basically just a fancy throttle body with a more simplified ECU. You can actually do some of the same stuff with a Sniper too but the Terminator/Dominator ECU is much more involved. Installation is also completely different AFAIK.
To the OP, do yourself a favor and download the Holley EFI software. You will need a separate USB cable to hook the ECU up to a laptop but the software will illuminate things much more clearly than the handheld. I barely use the handheld anymore, it just rides in my console. I check it every once in a while to make sure there's no flashing red warnings but other than that it just sits there.