Nate,
I can't say anything about a SOTA, but we recently upgraded from our Teres 265 to a 320. The performance improvement was far larger than the cost difference. This was one of the most dramatic upgrades we've done. If you decide in favor of Teres I strongly recommend the 320 over the 265 if your budget allows.
Obviously you'll have no problems mounting a TriPlanar (or just about any other arm) on a Teres.
I can't say anything about a SOTA, but we recently upgraded from our Teres 265 to a 320. The performance improvement was far larger than the cost difference. This was one of the most dramatic upgrades we've done. If you decide in favor of Teres I strongly recommend the 320 over the 265 if your budget allows.
Obviously you'll have no problems mounting a TriPlanar (or just about any other arm) on a Teres.