I'm looking at picking up an Edge A2 with the GPS and backup camera. I want it because it combines all three(guages, gps and camera) into one package. BUT it is pretty pricey, anyone here have one? How upgradable is the GPS? I don't want to be stuck with something obsolete and usless in 5 yrs. I'll need to get the CDN maps for it, does installing the CDN maps erase the US ones or can they both be in at the sametime? Is the memory expandable? Do I HAVE to use their camera or does it use a regualar coax input on the back for the camera?

What performace modules does it work with? Just the Juice?

Thanks!