Are velocity A23 rims suitable for building a wheelset for a 29er Mountain bike? I'm was looking to build a new wheelset that I can use on my rigid Karate Monkey 29er using either cyclocross or Trekking tires for gravel / dirt road riding and 29er tires for singletrack (mostly cross country riding). I need a rim I can use with either disc or v-brakes, depending on my setup at the time. My weight tends to be around 190lbs. I also tend to be really hard on my wheels and have bent rims on my 29er before.  I'm not really concerned about tubeless compatibility.

I planned to use this rim, the velocity A23, since it seems to be recommended for cyclocross on velocity's website. It seems to meet all the specs superfically. I can use it with rim brakes, it's relatively light, and it's 23mm wide, which should be good for wider 29er tires while still being suitable for 32mm+ cyclocross tires.  It comes with the appropriate amount of drillings for 32 spoke mountain bike hubs. It also doesn't seem that it would be too weak for disc brakes since velocity themselves offers them in a build as a road disc wheelset.  

Would the velocity A23 rim be suitable for this wheelset build? Are there any factors besides tire compatibility, spoke hole count matching the hubs, and brake compatibility I need to be concerned about?
I've briefly ridden A23's on a road bike, and while I think they'd be OK for cyclocross I did find them a bit flexy (I am ~220lbs).  I've spent significant time on the delgado cross rims, and I found the A23's noticeably less stiff.  I think you'd want something a bit beefier for singletrack riding, especially if you are hard on wheels.  

In your situation I'd probably want more of a mountain bike rim that's skinny enough for the cross tires  than a road rim that might be strong enough to stand up to mountain biking, but imagine the lack of good mountain bike options with v-brake compatibility does make the road rims more attractive (along with their light weight).  Guess this all depends on your weight and trails you ride though - I'm a pretty heavy guy and ride in eastern PA where we have a lot of rocks/roots.  A lot of people seem to like the mavic open pros as a 29er rim and they don't look much beefier than the A23's - I always assumed these folks weighed 120 lbs and were riding really smooth singletrack but I guess I could be wrong.

If sticking with Velocity, maybe the Dyad would be more up your alley?  They look a bit like A23's on steroids.