I'm just now mounting the M1G hardware, LAN switch, data/phone modules, etc. in the enclosure (the house was "pre-wired" twenty years ago), so I'm a little bit ahead of you. I've also purchased CQC. My questions...
1. Why are you connecting the CQC box via RS-232 instead of getting the Elk ethernet adapter and connecting that way? I've always assumed that CQC could talk to the M1G via the network, but maybe I'm wrong on that. Are you planning on using the two Elk software products, and if so, can they communicate via RS-232? I don't know the answer to that and I'm too lazy to look it up.
2. If you are planning to have a DSL connection, you may want to get a "ADSL filter/phone surge module" with a RJ-31x jack like the Channel Vision P-0411. It makes easy work of sorting out the phone line(s) with respect to the various types of connections (DSL/security/phone).
I got a TrippLite AV550SC UPS for my system. Delivered a few hours ago. Since I have the M1G connected to my LAN via a switch in the same enclosure, I want to ensure that other components besides the M1G have backup power -- the LAN switch, the M1G ethernet adapter. As mentioned in another thread, there are other (some cheaper) options such as getting a power supply with a battery backup, but that's a little more difficult if the devices use different voltages. I doubt I will plug the M1G into the UPS since it has its own battery. The downsides of the AV550SC that I can see immediately is that the battery is not documented as user-replaceable. Since opening the cover to find out for sure will void the warranty, I have to wait until the warranty is out before cracking it open. It does not have an outlet that has surge suppression but no battery backup on it like some UPS's do. If it did, I probably would have plugged the M1G into it for the protection. It does fit nicely into the typical enclosure (bottom left corner, preferably). I'm using a 50" enclosure for all the components and a 19" enclosure below it in the same wall cavity for the UPS, battery, wall warts, etc.
Ira