Which monitor for film/photography editing? I have rMBP 15" 2013

Hello,
I am in need for a actual monitor to do my film and photography editing as I find the 15" especially for film editing can be quite frustrating when working on big projects.

As I have never bought a monitor before I really have no clue.

First question, what size? Ideally the bigger the better, 28" would be nice, but I've never seen a 28" monitor, perhaps a 24" is enough or 26"?

My budget is under $400.... but I'd spend anywhere up to $700 if it was really worth it.

I will be connecting it to my 15" rMBP Late 2013 (fully spec'd out if that changes anything)

I really like these monitors, even though I know nothing of them, so any suggestions would be extremely appreciated. Thank you.

28" by Samsung – http://www.ebay.com.au/itm/Samsung-28-LCD-LED-Monitor-U28D590D-1ms-3840x2160-UHD -DisplayPort-PIP-HDMI-x2/271489800592?_trksid=p2050601.c100103.m2451&_trkparms=a id%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20140211150826%26meid%3D845059270 2543159256%26pid%3D100103%26prg%3D20140211150826%26rkt%3D4%26clkid%3D84505940919 66293398&_qi=RTM1714243

27" Inch by Asus – http://www.ebay.com.au/itm/Asus-MX279H-27-AH-IPS-Full-HD-LED-HDMI-VGA-Frameless- Monitor-2x-Stereo-Speaker-/261264890118?pt=AU_comp_monitor&hash=item3cd499d906&_ uhb=1

Dell UltraSharp U2410 – http://www.ebay.com.au/itm/Dell-UltraSharp-U2410-24-Full-HD-IPS-Widescreen-LCD-M onitor-HDMI-USB-Card-Reader-/230958581432?pt=AU_comp_monitor&hash=item35c63446b8 &_uhb=1