I have been looking at the CHS system or awhile now too. I will probably pull the trigger on it very soon. Down the road, I will upgrade to a Bayou Classic 1160 and add another 1650 watt element, wire in another PID, on/off switch and separate power cord running to a separate 20 amp GFCI outlet. I know I could build something similar for cheaper, but for right now, I like the all inclusive nature of this deal. I've been extract brewing for awhile now and want to make the jump to all grain and this seems like a decent option.
I'm actually in a similar boat. Going from extract to all-grain BIAB. I have been looking at this system for a while. I was thinking about supplementing the heating with a HotRod from brewhardware. If you purchase this system, please let us know how you like it.