Having a flippy screen - Whenever I "go back" to the T3i that started my recent chase in imaging for a couple of days. The first thing I miss is the flippy screen. Not only for Video but for the Macro/tripod work. Be able to tilt the screen up, down, etc so I don't have crane around is a wonderful thing. If you have a camera rental place nearby you might try a flippy screen model for a weekend.

If you aren't going to be out in the brutal wet/salt etc this one feature seems to offset a lot of the other "pro" level step up in functionality which really might be quite minor in the totality of imaging effort.