Hi, I currently have a basic AVR, Yamaha HTR-2064, part of the YHT-196 package. I have changed the speakers to QA 2010i's for L&R, and a 3090c centre, along with a CA SX-120 sub. Rears are still CA min11's, although I mostly use 3.1 set up as they don't tonally match all that well. I want more QA's for the rears but the living room layout doesn't allow it currently. The main reason I want a new AVR is because I now have a 4k tv, xbox one s, and would like to be able to decode HD audio, and hopefully be able get better sound quality. My blu ray player is the LG BD660. So my main question is which range of receivers would I need to look at to give me 4k support and better SQ, if at all in my price range at £500ish. Atmos and DTS:X are not so important as I doubt I would ever use it, unless it still plays in 3.1, but DTS HD MA is a must. Some I have been looking at, Denon AVR-x2400, Marantz 1508, Sony STRDN1080. Thanks in advance.