I had the Durham 900s in Yew several years ago and they indeed very nice speakers. I’ve had ProAcs (Super Tablettes, Studio 1s), Celestions (C7, SL6, 100s), Missions, Mordaunt Shorts, Linns, Monitor Audio, and Wharfedales and the Durham 900s held their own with all of them as I recall.
I now live overseas and there are a pair Warwick 3s in an uneven burnt wood finish and a pair of Castle Inversion 50s in maple that are available not too far away. The Inversion 50s look really cool but there is not much information on them on the internet. Anyone have experience with these? They seem to be different from the other floor standing Castle speakers.