I think this is a really interesting question.
You may want to read up a bit about each of the strains you listed, and see what beers they are used in, how they are handled, and what yeast would work best in your system.
Here is my quick breakdown.
A Belgian Quad is not a BJCP recognized style, but I guess is superficially similar to a Belgian Dark Strong (in color, flavor, and strength). I'd look at what strains are typically used in the classic examples of a dark strong, and start there.
For me, that narrows it down to Rochefort (WLP540), Chimay (WLP500), and Westvleteren (who got their yeast from Westmalle - (WLP530) - but handle their fermentation schedule completely different than Westmalle).
Personally, I am starting my Belgian-style education with WLP530 (and voted accordingly), but will be conducting fermentation in the way Westmalle does things - pitching at 64, and raising 1 degree a day for a week, topping things out around 70F. That just seemed to me like the most reasonable starting point, and in everything I read, people really seem to like the WLP530 strain.
Good luck, and I'd love to hear a follow up with your experiences.
Joe