shopmyexchange.com has some great deals on these sony IPS 4k X720e models for pretty cheap right now.. You need to be active duty military or a veteran to login to see prices and purchase items.
Here is a screen shot that I took when logged in:
KDX43720E $350 [shopmyexchange.com]
KDX49720E -$450 [shopmyexchange.com]
KDX55720E - $499 [shopmyexchange.com]
I got the 49 inch model. Pretty amazing. I do use it as a huge computer monitor at times and I'm pretty blown away. It feels like a computer monitor, just bigger. Text is crisp, can't see pixels even when I'm only 4 feet away. I don't see any input lag at all in games.
43 inch might be the best deal though, but I think the 49 inch at 3-4 feet away is mind blowing. Coming from a 27 inch asus 1080p monitor. Gaming on this thing is crazy. Forget hooking 3 monitors up together one big pc monitor is the best way to go.
I don't see any input lag at all on my 49 inch sony. Text is crisp...viewing angles are second to none...even beats out the "higher end" sony models on viewing angles according to rtings.com. After this I will never go back to a PC monitor