slynger said:

so dumb question, what is the difference between mkv and AVCHD? Excuse my noobiness

Two different container formats. AVCHD is essentially a stripped-down Bluray that can fit on DVD; the container was originally created for digicams to record HD video directly to DVDs I believe. MKV = Matroska Video (like the dolls). An advanced container format typically used across teh Interwebs for all manner of HD content. The AVCHD will likely be more compatible with some Bluray players, and the MKV will have more audio tracks, a higher bitrate, and slightly easier playback on PCs via VLC/MPC (imho better seeking than the avchd's mt2s file)

Originally said, 'The AVCHD will likely be more compatible with some Blurays." I meant, with some Bluray players, not with the the BD spec; the video inside in the MKV is already spec compliant, as Harmy noted below. Wasn't trying to say anything different.