I have aerial 6s as well (and 5s, and a cc3b soon). You might try the older L-series ADS. They never made a HT-oriented speaker (e.g. dipole/bipole) but some of their small monitors are quite nice in that position. L300, L400, L470, 570, etc. Many to choose from, all nice, most relatively cheap. Voiced similarly to Aerials- no surprise since Mike Kelly of Aerial ran a/d/s/ for many years before starting Aerial. I have some L400 a/d/s I got in *mint* shape for $175/pr. - have seen them for even less too.
-Ed
-Ed