[quote name='ROB64']I'd say Class 4 would work for most things, but HD video recording (if it's high quality) will definitely require something a little faster. My sister's Handycam takes great videos to the built in memory, but with a class 4 card (I think) it's very choppy.[/QUOTE]
Then that's probably it... my phone has a 2GB microSDHC card in it and HD video recording (during any type of movement) is choppy as hell.
Man, those class 10 cards are expensive. There's a PNY brand for $40 but that appearantly doesn't work with phones. Next cheapest is Lexar... not sure I trust that brand. I would love to find a 32GB class 10 SanDisk or Transcend or Kingston.