Are the dual core i7 or i5 Airs or 13" MBP fast enough to natively edit AVCHD 2.0 files in FCX? My wife shoots short documentaries and even "short" documentaries are generating a lot of huge ProRes files in FC7 that are starting to add up to a lot of space on my server. Her 2008 MB and even my 2009 MBP won't even play the native AVCHD files without converting them to AIC or ProRes. I know that editing in AVCHD is less "efficient" but it would be great to be able to cut the film in its native format and then convert it to ProRes if we need to grade the footage or do anything more fancy than basic cuts and titles. Aside from basic video editing she doesn't do anything else (like motion graphics, photoshop, or video games) that taxes her 2008 MB so we'd rather not drop the money for quad-core laptop--plus she doesn't want anything bigger than 13".