+1 on the tubeless ready option. I've been riding full UST setup on my 26" wheel bike for the last 5 years, and was really adamant that the tires had to be true UST tires, because my experience converting non-UST tires was spotty - some worked, some didn't work, and the ones that worked would still "burp" at times, or leak now and then, etc. With UST wheels plus UST tires, it was just rock solid, plus aired up easier, etc.
However, now I'm running C29ssmax wheels on my 29er, and using tubeless ready, and as the others have said, it's the ideal solution. The part you really need with UST/tubeless is the bead fit/seal. The casing is a waste, because even with a true UST tire, you should still run sealant, so why waste the extra weight of a full UST casing?
I've done tubeless conversion of Rampages and WeirWolf 29ers with not good results. I blew a Rampage off a wheel, and the WeirWolfs weren't optimal either, both have casings that are too light/thin. So, I'm using only tubeless ready tires now. I've used Conti's, but am currently focusing on the new Bontrager TLR offerings: the 29-3 (I am only using the front tire (the big one)), and the FR-3 is my real fav (it's quite large and won't fit in all frames). These both mount up tubeless with total ease! I used a floor pump to mount them, both as brand new tires, and then when swapping around. I've had no burping, and that's quite a statement given I run the FR-3's at 13psi up front and 18psi in back!
So, my take is that I want a UST rim, and then I'll use tubeless ready tires with it. I have not used Stan's rims, but apparently they're equivalent and you'll have more choices (specifically you'll be able to get wider rims if you want).