I've used a 27" 1080p 60Hz monitor for the last 6 years. I plan to upgrade to a 4k 240Hz monitor when the PC industry supports them. I've been experimenting with a 50" 4k 60Hz monitor trying to get a feel about what size monitor I might want for 4K. Obviously 27" would be ridiculously small and make 4k irrelevant. 40" seems about right. But, curved screens (which is an unbelievably stupid idea for family-room TVs) seems to make 50" monitors a reasonable size. I haven's had a chance to experiment with 50" 4K curved monitors yet - but, I will definately look for that opportunity.