Without getting into a lot of detail, here is a ranking of the ones I tried, Compared to the prior speaker
Proac Studio 140 - Harsh upper midrange and lacking in detail compared to the other speakers.
Harbeth Compact 7 ES-3 - Very smooth, not very dynamic, easy to listen to without any listening fatigue, lacking in bass response.
Proac Response 2.5 - Smooth and dynamic, plenty of detail, bass response goes very low, but a little loose.
Proac Response D-40r - More inner detail and better imaging without harshness, bass response not quite as low, but better defined.
The Proac 2.5 is a great all around performer, getting a little long in the tooth, but a great price performer if you can find a pair used. It is inefficient, but worked well with Quicksilver V-4 amps.
The Proac D-30r, which I have heard many times, is another speaker you should consider at a lower price point than the D-40r. It may be hard to find used, but if you are interested my local dealer may have a demo pair for sale.