Don't select 5900 cause 100hz is not fast enough, you will see blur image for any fast movement. 200hz is not good but for the price with 4K is acceptable, the sales also told me to check out LG 49' 8500 version with a bit more in price but i feel that samsung 6000 is a bit better in picture.
Sony 49' 8500 B is double the price so is too expensive.
Actually, Samsung HU6000 C/P is high. But someone said Samsung HU6000 is fake 4K. it's supposed 2K only (2xFHD). I knew current less of 4K source. But TV usually using over 5 - 10 years (Touch wood). so I am looking for 4K TV.