Although the wiki guide is pretty good, I'd suggest taking a look
here as well, last night I decided to jump ship 100% and install to the NC instead of an SD card, very pleased with results, overclocking very stable! The linked guide is more in depth than the wiki guide IMO.
Good luck with whatever route you choose!
Also, for a case that doesn't cover speaker, check out
Otterbox, it's what I'm looking at.