As the title says, a fairly cheap (around £100 delivered in UK) monitor no larger than 21.5/22 inches (preferable 21).
I will have a gtx 780 and 4770k if that matters. I will eventually run surround, so they have to be this size. DVI is a must, and VGA/HDMI are also welcome. I have some Amazon vouchers too so it if preferred to be from there, however, I am sure I will not struggle to spend them in the next few months