Without delving into the sonic differences, nor the match between your amp (of which I know absolutely nothing) and the speakers you list, I would submit that the Aerials and Dunlavys are not the easiest of speakers to drive, maybe a bit much for your amp's 40 watts. I own Aerials and as many here at this site will tell you, they are a little power hungry. The Proacs may match better with your amp, from a power/current standpoint. Even if the deal is that good on the Dunlavy's, if you couldn't fit the Proac 3.8s, how ya gonna fit in the SC-IVs? Those things require an addition to most houses to enclose them. Maybe an amp would fit into your future? It certainly would open up some possibilities on other speakers.
My opinion, for what it's worth.
My opinion, for what it's worth.