Monitor close to the wall to replace Allison 4s


I have to have speakers against the wall in my office, so I have the second edition Allison 4s (2002), which are pretty impressive speakers. I am bi-amping them with 2 TAD 60s with EL 34s and they sound very good, but I wonder if a newer generation of speaker, thinking of Joseph RM7XL, Kitty Kat Revelator, Harbeth P3 ESR, The Clue or any other suggestions, would give better resolution, transparency and imaging? Can I improve significantly on the Allison 4s with a budget of $2500? Thanks!
springbok10
The Harbeths would be my choice only because I have them and I think they are the best monitor I have owned.The only problem is you can't bi-amp them!
Denis- I was very impressed w the stacked pairs of the Clue that was shown at the NY Audio Show last month. $2K for 2 pairs w the stacking stand, IIRC. Driven my Hegel integrated and they were set up very close to the wall behind them. Never heard the Allisons.
I'm not a big fan of Naim overall, but I had a chance to hear a small pair of speakers they make. I think it was the nsat or something similar. They sound pretty good and you can put them close to the wall. I also heard a small floor stander from them. I don't remember what model it was but they were about $2500. They were pretty good too.