WiND for 1st season, Phlianthropy for 2nd, til they started to go on hiatus, then I switched to WiND, then un fortunately their encoder's comp broke, then I switched to Hauu~. (such a hectic twist, lol) I just don't like mkvs, due to the use of AMVs
When I watched the first season for the first time, I watched it with WinD subs. I downloaded the Ayu subs though.
As for Kai, I went with Hauu~ but will probably download some higher quality episodes at some point.