I just finished the switch from Comcast to Qwest (20Mbps DSL went live last Friday, dropped modem off at Comcast this morning). I too have had short, random disconnects with Comcast, annoying when gaming or VPN'd to the office. I had daily disconnects at 10:30am, modem wouldn't lose sync, but I would have 100% packet loss for 20-25 minutes. The connection was also weather-sensitive - during the last two extreme cold snaps here in Minneapolis, the connection was essentially useless.
Qwest was a snap - placed the order with a few mouse clicks, the modem showed up 2 days later. Ran their QuickConnect install, plugged my router in, and I was up and running. Ping times are roughly half of what I saw with Comcast (27ms vs. 47ms avg, measured with Smokeping). More importantly, it's consistent. Looking at the 30 hour graph for Comcast, the line looked like a sine wave. The equivalent graph for Qwest is perfectly flat. Gaming seems MUCH smoother, web sites are much more responsive (using OpenDNS, did the same on Comcast).
It's only been a week, but I'm a happy Qwest customer so far.