Please go with dsmlink. IMO, the price is actually a little low considering all of the things it can do, as well as the non-stop modification and customer support that the guys at dsmlink provide you. Also, like scottsee mentioned, the safc+pocketlogger/palm combo is not much cheaper than dsmlink when you really think about it. I got dsmlink right after intake/exhaust and I still found it to be the absolute best mod I have made to my car.
Also, why the ACT 2100? The 2600 is what you'll want/need, so go with that. I'm pretty sure the 2100 is a clutch more for the moderately modded FWD cars, not low 12 AWD car
EDIT>>> Damnit Kevin you posted at the same time as me!