Don't get the tech edge as they only make a kit and don't guarantee it to work with any software, we got ours to work with the nistune after a lot of stuffing around.
The innovate is really good, you can also buy the obd-II reader kit (LM2) which displays the o2 in realtime and can be used as a scan tool.
If you want something a bit more advanced then look at the Dynojet wideband 2 system, it is available in an LCD multifunction or a guage, if you decide on buying it then get it from Serco at Capalaba, cheapest by far.