There are four places in Denver that have anything beyond a perfunctory pipe selection. Edward's is far and away the best in terms of pipe and tin selection, not to mention an expert staff, most notably (as far as pipes go) Tom. The back smoking room is so turn-of-the-century hardwood-and-leather men's smoking room looking you wouldn't be surprised if Sherlock Holmes or Alfred Dunhill walked in. Heaven.
Jerri's on 16th St. has a fantastic pipe selection if you're into Petersons and rusticated Ardors, though pickings get significantly slimmer if you're into something else. Tin selection rather small. Staff is very friendly, but I wouldn't call them pipe experts.
Prince Philip's Pipes in Tamarac has expert and friendly staff, rather small pipe selection -- though a few pretty nice ones last I went -- and a tin selection better than Jerri's but far less than Edwards.
The Tobacco Leaf has the next best pipe selection after Edwards -- really quite good when I was there a year ago -- but I have not been back because I find the proprietor to be... not my kind of person. Pushy, condescending, really impressed with himself and he admits he no longer smokes a pipe so he can focus on cigars. I bought a Savinelli Autograph from him and told him I planned to smoke latakia mixtures in it, and he told me to break it in with an aromatic because it would smoke cooler. ???!! I ignored the advice, of course, but it galled me to hear him say it with such authority. I will say in his favor that he let me put a down payment on pipe and come back the next week with the rest of the dough.
Tewksbury & Co. in Writer's Square gets an honorable mention for some nice Arley Curtz pipes, but the rest of their pipe stuff is decidedly perfunctory and they have bulk tobacco only, no tins.
Barlow's in Lafayette was liquidating their pipes under new ownership when I went a year ago, and I hear they're strictly bulk pipe tobacco and cigars now.