I believe I am familiar with the NE area.
We do not have much in the way of bike shops.
The one that I am familiar with is Derby. Small cramped store with not much in the way of what you are looking for. Golden Bear in Thornton was near my house but is now closed.
To find a decent selection of cycling shops I usually head to the NW area.
1. Golden Bear's main store in Broomfield off of Nickle. Not sure about commuting gear due to the fact that I usually purchase parts at GB. This is a large fairly new store.
2. Bicycle Village. Decent fairly large store off of Wadsworth and 92nd. Again, not sure about commuting gear.
3. Performance. Has an okay selection of commuting goods. I purchased my rack trunk there. 88th and Wads.
If you head further south, west, or to boulder your selection increases. Unfortunately, we live in an area almost devoid of cycling shops. The way Thornton is expanding one would hope that someone would put in another shop. A wrench at Golden Bear in Thornton (before it closed) told me that they had a banner year and were looking at opening another shop in Thornton eventually. I believe they had a lease issue or some such thing.