IMHO just get the C3 and get a gophone SIM off of amazon for $2. Then you just pay as you go for sevice with gophone and there is no extra charges with alarmrelay. It works flawless.i dont have my uplink 2500 yet. but when i get it hooked up and setup, they will charge $45 to set that up, vs $35 that i paid now (also $12/month additional because its a cell service.)
My DD-WRT does a successful force once every week or 2.