I don't want to part with my 12" for an air yet, so I am thinking of a 320gb wd ide hd. It's 5400 rpm, as I haven't seen anything with some decent capacity at 7200 rpm. But I am eyeing the runcore ide (pata) ssd too. I am a bit worried though that the difference between the wd hd and the ssd will be marginal due to the pata interface. Any experiences guys?