The C1 is far superior to the 1.4----much more detail, much better bass, and driver integration is really superb. honestly, i liked my old 1.3SEs more than the 1.4. some may disagree with me, but that was a very special speaker. the Special 25 has a hot top end, so some like it, some dont (i prefer the more neutral Dyns)
as far as the BAT, i consider it pretty neutral but with a hair of liquidity in the midrange---i have heard Dyns with Sim and don't think that combination is all that the marketing guys think it is. i think Sim is pretty stale sounding. the BAT also is very well built and can drive Danes with ease. the other integrated i'd like to try is the Krell FBI---but its cheaper probably just to get a 400cx and tube preamp.
there are several BAT integrateds on the 'gon right now, so using one in your system would be an inexpensive way to try it. i also had a Pass X2/250.5 on my Dyns and liked that combo very much---but the Pass integrated is still pretty expensive (i sold the 250.5 because it didn't fit in my rack/configuration)
Cheers,
KeithR