Since you're moving to a larger room I'd consider dual subwoofers, maybe something like the SVS SB13 that is excellent and you can get a great deal if you buy two. Integrated properly I think that combination with your KEFs could potentially leave many a jaw dropping to the ground in disbelief. The key will be integrating the subs, which can be tricky and potentially expensive depending on how far you go with it. Best of luck and let us know how it goes. I'm thinking of doing something like this myself.
Bookshelf speakers-double up,kef ls 50
I would like to ask,could I get increased performance,if I put one pair of book shelf speakers on top of another pair.My amp is powerful enough.Im using kef ls 50,and would consider getting another pair if things will shine.Thankyou