I currently have a 1080 HD projector to a 99" screen. This was set-up nearly 8 years ago. The AV receiver (B&K) does not have HDMI ports. This system currently uses RCA cables and the picture and sound are very good (Paradigm speakers). Will an upgrade to a new receiver and 25' HDMI cables be worth the cost for a potentailly improved picture/sound or am I good as is?