Looking for amp for totem wind?

I find a lack of power for my totem winds.The amp im now using is a bryston 4b st, which gives 250 watts at 8 omhs and 400 watts at 4 omhs.I find the top end a little arch but the bottom is good.I Listen to all kind of music,from jazz,rock,classic,etc. Im looking at the bryston 7b sst.I have read some reviews and the top end is suppose to be smoother.The room is aprox/ 17x25x18 feet high.Thanks for reading