Final Cut Pro: Additional RAM may be recommended for High Definition video formats
Compressed HD needs 2 gigs. Uncompressed 4
Final Cut Pro 6.0.1: About transferring AVCHD footage
AVCHD footage transfers like P2 - through a special version of capture. SD won't work. Neither with DVD recording AVCHD. It'll be USB 2, and last it'll get transcoded to either AIC or Prores
Final Cut Pro 6.0.1: Incorrect AVCHD clips may be transferred
Long clips 'span' across a number of files (and will likely 'hiccup' with each jump from file to file.) Make sure you shoot in smaller moments.
Final Cut Pro 6.0.1: HD ProRes 422 capture requires Mac Pro or Power Mac G5 Quad 2.5 Ghz
It seems that if you want to capture directly into Prores, you just need a powerful machine.
Final Cut Pro 6: 1080p24 workflow for Canon HV20 camcorderFinal Cut Pro 6.0.1: Working with spanned AVCHD clips
How to work with Canon's flavor of 24p with this camera. Have this camera? Must read.