How are you getting from ProAc & Spendor to the DeVore? The 0/93 is a high efficient speaker that's nothing like the other 2. It would seem a pair of Gibbon's would be a better choice. Also, your room is very small. I'm surprised your D30's aren't giving you some issues in your room. I wouldn't buy the D48's without an in home demo first.
Since you like British speakers, you may want to consider Living Voice as well.
Since you like British speakers, you may want to consider Living Voice as well.