The Pacenti rims currently cheap on On One are more than worth a consider. IMO they’re better than Stan’s rims, certainly build into a nicer wheel. The CL25’s are the XC race rim, the TL28’s are almost as light and a useful bit wider and stiffer to be fair.
Hub wise, there’s plenty of lightweight options out there, depends on your budget. Look at the likes of Tune/BOR/DT Swiss for very light yet still robust. Hope Pro2’s are a decent hub, just they’re not all that light, still not heavy mind.
As for the spokes, wouldn’t go to DT Rev’s myself on a 29er, they’re just a bit twangy IMO. Almost as light and a bit stiffer are the DT Supercomp’s which make a better MTB wheel.