Cyfa: Hope don't make rims but AFAIK neither do I9. Build either with your choice of rim.
And I own a few sets of Stan's 29er rims and I don't rate them as high as Mavic. Mavic I see as a manufacturer of rims of outstanding quality. Stan's to me is more marketing driven and I was quite disappointed with the finish of my first set of Arches 4-5 years ago. They should do a lot better at the price point.
That said, Stan does the marketing thing very well, Mavic and co. simply did not offer the mix of dimensions I was looking for in rims.
Enjoy!!