Once again thanks for the reply.
I have used the LR Library, Develop and Print modules from 3.3 and till now 6.15 - the very last perpetual release. Through all the years I have used keywords and capture on every image, used SmartCollections based on those keywords as well as Collections for the yearly calendar, book projects, exhibitions et cetera. So I may not live happily without a DAM solution for long.
I have had a brief look around, and PhotoMechanic and IMatch both seems to do the job. Although both are pricey for "just" a DAM solution at $139 / $119 respectively, about half the price of DxO PL 3.
Regards Johannes Elkjaer Madsen