Okay -- the research has begun. My first stop was Chocolate Potpourri. For what it's worth, if you're in the area, this place deserves to be visited just because the owners are so nice. I had a lovely time chatting about chocolate while I was there.
As for comparing them to the Wen Chocolates, the interesting issue I'm facing is that, with chocolates at what seems to be equal levels of quality, there are differences that are simply differences -- not flaws or shortcomings or compromises, just differences.
The Wen Chocolates -- not just hand-made, but made to order. On the whole, more exotic and/or unusual flavors. Mouth feel is extraordinary because the outer chocolate shell is so incredibly thin it almost isn't there -- almost instant contact with ganache -- each confection just melts in your mouth. (They are so delicate, in fact, that summer shipping is discouraged.)
Chocolate Potpourri -- hand made, but made in larger quantities. I'm guessing it's because they supply high-end hotels that the outer shell is so much thicker (more handling, needs to be stronger)—you have to either bite through it or wait a while for it to melt before you reach the ganache inside. The heavy chocolate shell is of extremely high quality, so it is no hardship to have it melting in your mouth, but it sometimes overwhelms the ganache inside.
Overall, I'm more in love with the mouth feel of the Wen, but I'm also really loving the great dark chocolate coating on the CP truffles. Among individual pieces so far, I prefer the black cherry from Potpourri over Wen's "Cesnja" (morello cherry and brandy with white pepper) -- but that's probably because black cherry is one of my favorite flavors. However, the Wen "Violette" (black violet tea, dark chocolate, candied violets) was unbelievably good (if you love floral flavors, as I do) and hard to top. Each has a bourbon chocolate that is excellent, and I'd be hard to choose between the two (in fact, Bourbon-Vanille is one of the best of the CP truffles so far). The dark chocolate with rosemary from Wen was remarkable.
I still have four more flavors to try from each location, from this first experimental batch. On the really positive side, since the differences are definitely not in the arena of quality, just in texture and a couple of favorite flavors, the CP truffles will likely become my go-to truffles, as they are less expensive and I don't have to pay to have them over-nighted to me. (Plus there's that "really nice people" factor.) However, if you get to Denver and you like unusual chocolate, I'd recommend you try Wen Chocolates.