Midway USA had a really nice pistol bag a few months back, but I think it's out of stock now. Personally, I prefer a hard case, like a poly toolbox, for carrying ammo and cleaning supplies to the range, things don't get shuffled around like they do in a bag. The medium sized ones from Home Depot and Lowe's work well if you carry the pistol in them, and the small ones are ideal for CHLers.
With what you are planning to carry, weight is a consideration. Most of the bags that I've heard of failing have had straps and handles pull loose from the weight.