I used a 24" 1200p monitor for several years, and it was fine. Now I have a 27" 1440p monitor and I feel like it's perfect. Any bigger and I'd have to sit back farther. --- My movie and gaming room: http://imgur.com/a/IjWr1 My pets: http://imgur.com/a/P9VGU
The bigger the better, but the pixel density can NOT go under 100 (2560 x 1440 @ 27" is around 110 ppi) Also I have only 1 monitor now, used to have 2, the other one was a 1200p 24". Got rid of it because I don't like the huge color shift issue of TN panels and I also don't like turning my head way too often. I never miss it at all I do look forward to getting a cheap and huge 4K IPS monitor from China or Korea though --- WC i5 2500k @ 4.4 ghz, 2x GTX 670 DirectCU II, Corsair P128 SSD, 16gb G.Skill 1600 DDR3, Zalman 1000W PSU, Cosmos 1000 Case, HP LP3065 @ 2560 x 1600 IPS
I enjoy my 30" 2560x1600 monitor quite a bit and find it an ideal size for a single monitor setup. I almost want to cry when working on a tiny 13" laptop screen at work all day. It's like night and day! --- Many Bothans died to bring you this post.