I would base that decision on the listening habits and number of seating positions. The Surrround 3 will provide a more diffuse surround field and would be suited to movies with a setup which has multiple seating locations. If multi-channel music quality is more important and you have primarily one main listening position, then the 200B could produce better results. Over $1,000 per pair for surrounds is a hefty investment though. If this is primarily for movie viewing, remember that surrounds carry mostly effects tracks. You don't get a lot of dialogue or music from them, which is why the others recommended saving some cash on the surrounds. The 200B is suitable for a main speaker paired with a subwoofer so it's overkill for a surround. If you think you'll get into multi-channel audio then they might be worth the extra.
Not that you'll be the first to use high end speakers for surrounds. There are plenty that have tower speakers in the back. You could even use the 200B for rears and the Surround 3 for side surrounds. They are your duckets after all.

For in-ceiling ATMOS these
full range speakers from MarkAudio are only $65 and would do just fine. One of our forum regulars swears by these.