I'm stuck between the 2 options at apple.com a couple points. Can anyone offer some advice? I've been ipadding and smartphoning for long enough that I'm totally totally rusty when it comes to pc specs Is 256mb enough video memory these days? That's a big step down from the 1gb offered in the higher end AMD gpu. There will be a decent amount of photo and iMovie type stuff going on with this system. Also, with those uses in mind, is the high res display a worthy upgrade? Thanks!