Unless you're going to adopt the Warre style of beekeeping (minimal interference, just two inspections a year, etc), I can't really see the point of having one Warre hive amongst an apiary full of Langstroths - because - nothing is interchangeable with any other hive and so there can be no mutual support between them (by the swapping of combs and such-like).
If you already have 8-frame Langstroth boxes, then you can very easily make a 'near-enough' Warre hive by simply adding a quilt box. Then - you can play with nadiring, and the other Warre oddities to see if that style of beekeeping is for you (it's about a style of beekeeping, not just about boxes). Should it then press the right buttons for you, then you could go ahead and made several Warre hives, but without incurring any outlay whilst you're checking it out.
LJ