I don't have an ST60 but I have the GT50. I have my tv connected to my HTPC via HDMI and can control everything my with my iPad or Logitech harmony one remote. My HTPC has 4tb and an external 4tb hardrive. I can play all my bluray MKV's no problem whatsoever. The program I use in my HTPC is XBMC or Home Classic Media player. It plays them all in 1080p with HD Audio as well. I don't use DLNA since my HTPC is wired to the tv. Only time I use it is if I want to see my pictures from my phone on the big screen mirror in it.
Media room- LG 4K OLED EG9600, Pioneer Elite VSX-90, Samsung 4K K8500, Klipsch Gallery G28's, Klipsch Sub 12, Klipsch RS-52 II, Optik HD cable
Living room- Sony 4K 79XBRX900B, Onkyo RC-360,HTPC, Klipsch Reference R-62II, Rc52II,PS4
Gaming room -Panasonic ST60, PS3, Wii