mr_dove,
Great site! Good info. If you'd like to add my comments to your site I'd be honored.
Cal's Sporting Armoury:
My 1 experience with Cal's was about the same. I got buzzed in and looked around for 10 minutes or so and no one even acknowledged me. (If they have to buzz you in, they can't make the excuse that they didn't know you're in there!) I didn't care as I didn't want to buy anything anyway. The guy there was on the phone with customer and I remember chuckling to myself about how he was treating the person on the other end.
Tom & Joe's Firearms:
My first experience with Tom's was similar to other's. He seems to have several "groupies" or friends that come in 2-4 times a week just to BS. The shop is so small that there really isn't room for a lounge. Some, including a good friend of mine, think he has an attitude. I've gotten to know him fairly well (from buying many guns from him) and think he's first rate. For me price is number one. When I'm ready to buy I already know exactly what I want right down to the exact model number. All guns are shipped overnight, so if you don't mind waiting a day or so it is the place to buy. I have shopped all over town and have never found better prices. He sells a ton of guns because of his prices. His shop is small and he is one-man operation but that's exactly how I want it to stay. Low overhead means the best prices in town on both guns and ammo. Before you buy somewhere else, call him for a quote.
Green Mountain Guns:
Green Mountain Guns has what I believe to be the best combination of selection and prices. You may be able to find a better price, and you can find better selection but you won't find a better combination both anywhere else in Denver. Customer service has been friendly in the last year. There are often very good deals to be had in the used/consignment case.
The Gun Room:
Friendly helpful people and a fantastic selection. Prices seem to be all over the map. Highest prices I've seen on some items, lowest on others.