I had a 4670, a blu-ray drive that sometimes would not play a disk, an older non bitstreaming AVR, MPC-HC, PowerDVD 9 and a 4 year old 58 inch panasonic plasma.
I kept the plasma TV.
I replaced the 4670 with an Asus 440. I started using MadVR, LAV splitter, LAV audio, Cuvid and the latest version of MPC-HC. I also upgraded PowerDVD 9 to PowerDVD 11. My video quality using MPC-HC or PowerDVD improved dramatically.
I replaced the AVR with a Pioneer vsx-31. This is a HDMI 1.4a AVR. Pioneer was in the TV business and includes a video converter. My video looks like film now even for TV using 7MC with no pixel look. Also I started bitstreaming.
Then I replaced the Blu-ray drive and discs no longer will not play.
For those on a restricted budget, $300 for a new AVR may be too much.
But all the changes I made were money well spent in my opinion.
Anál nathrach, orth’ bháis’s bethad, do chél dénmha
Display: LG OLED 65e6p, Player: OPPO UDP-203, AVR:Yamaha TSR 7810, Streaming: Comcast 100Mbps RG6 to Cat6a, Speakers: Mains Vandersteen IIC, Center, Surrounds, Rears Klipsch