Century has that whacky history of being an importer of old and odd stuff that somehow got into bringing in new things of questionable quality. Without question, they have awesome catalogs!
The HK design is brutal on the shooter and the weapon, so I'd be -- cautious -- when considering the Century. Have you looked up any recent reviews or videos of them? It's amazing that buying a product from so e if these companies is like buying a wine: "Oh, '09 and '11 were fine years, but stay away from the '10."
Give or take, $700 can get you into a PTR on GunBroker. But even they started as something that many people probably questioned. Century has been offering 93s for quite a while, and apparently decided to get into the 91s. The problem with 93s is that any part that is unique to them are @@@@ near rare, whereas old Ukranian grandmothers have trunkloads of 91 parts -- so that was probably the motivation.
Sorry that I can't give you exact information, but it sounds like we're on the same page with being leery of literally and figuratively pulling the trigger on Century.