Guys I am also new and looking to buy a LED TV. Just confuse if get low end 4k or get excellent Full HD.

After reading a lot I found out that, if you really want a 4k TV only buy one with the below 2 items:
1. TRUE refresh rate 120Hz at least (not true motion, PMI, etc numbers)
2. Full array local dimming (FALD) or at least Direct LED backlight. Avoid edge lit ones unless it has a good review because some edge-lit can be equal to FALD and DLED backlight quality.

IF hisense cam guarantee 120Hz and DLED then it is very good buy. Also pay extra for added warranty will be worth it.