The Auditorium Theater capacity is 2400 seats. Having been to both Shea's and the Aud for many shows, the Aud is my preference. As mentioned the sound at Shea's is often a problem and I have never really experienced this at the Aud. Also, it is quite a bit smaller (almost 800 seats). Those last rows at Shea's are really far away!
On another note: is the tour selling any merchandise for Broadway Cares? Autographed windowcards, etc?
"there are people in our lives who change us in a way that nobody else can, and it's not necessarily the people you expect," Menzel