Personally I wouldn't go for the cheapest, go with the best. Like I said before Cflex was the deciding factor for me. And I can honestly say that I don't think I would be compliant without it. Remstar Auto With Cflex
If you get it without the software you only have 5 settings. Low limit, high limit, mask alarm, key lights on/off, and cflex level. Not very complicated and the best part is that it has CFLEX