Just to clarify and consolidate, these are the specs you need on any wheelset you purchase.
-700c/29inch
-135 mm spacing for the rear hub, 100 for the front (this is why the Vueltas wil not work.
-Disc ready (either centerlock or 6 bolt mounting)
I would just get another set of 29er wheels, preferably with a narrowish rim. I don't know what your budget is, but I just bought a set of XT wheels for my 29er that would fit the bill. Probably overkill on the road, but you can just as readily use them off-road, and a 28mm road tire should be fine. If you do use them off road, they are also tubeless ready if that appeals. They can be had for about 500 dollars if you shop around, I think.
If you purchase the exact same hubs, however, you are most likely to not have to readjust your brake calipers at all when swapping wheels.