Well, that's a fairly good sized room. I would think the 60s would work fine for HT only. But, if money is no object, the 80s wouldn't be overkill, IMHO.

If you went with the 60s you could put the money saved into a BIG sub. Don't scrimp on the sub for a room that size. Better to get the 60s and a thumper of a sub, than get the 80s and a lesser sub. If you can afford the 80s AND a big sub..........!

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton