Hey Parkerco,
Most LDSs in Denver don't cater to the drysuit diver crowd, so I don't have an answer to your question (but I'm very interested in what others may recommend). Other than FlatIrons, A-1 is probably your best bet but I'd give them a call first.
FYI, I use Turtles, which are basically the same as ScubaPro Jets. At the time I bought mine they only offered one size, 3XL. I just looked at the fins and noticed that they don't have the size imprinted on them! Harumph. Anyway, the huge foot pocket fits my DUI size 10 rock boots, if that helps.
If you don't find a vendor in the Denver area you can always order online. If I may suggest, DiveRightIn scuba (
Dive Right In Scuba), Scuba Toys (
Turtle fins), or Dive Gear Express (
Classic Fins) would all serve you well and probably provide a full refund if they don't fit. I would give them a call and explain your situation, I'm sure they'd be glad to help.
I also have a Viking with integrated boots, and the 3XLs are too big. Meanwhile, my tropical Tusas (L) are too small. So I too am shopping for another set of fins, probably Hollis F-1s.
Good luck! Let us know how it works out.
g
PS - I'm thinking I want to go for a dive at Aurora Res the last weekend in October -- just before they close for the season. If you're interested, you're more than welcome to try out my fins at that time.