I think a new receiver would help. It will get you HDMI that will greatly simplify things and allow you to listen and enjoy the new lossless sound formats, DTS Master and Dolby True that are found on Blu-rays. Also, I agree with considering the Pioneer Elite SC-61 or 63. The new Class D3 amps found in these units have been very well reviewed and received. I have had four Elites now and have had no problems with any of them. I also find their Advanced MCACC very effective and recommend it. While other room correction solutions are probably just as effective (and I am sure you will hear from their proponents) my vote goes to the Pioneers you are looking at. The rest of your system seems solid and I think you will benefit greatly from the receiver upgrade.
See, no smarta$$ comments here. Good luck and enjoy your upgraded system when done.
Parasound 5125, Parasound 2100, Pro-ject RM 5.1SE, Dynavector 10x5, Pro-ject Phono Box S, Pro-ject Speed Box II, Arcam FMJ CD17, Pioneer Elite VSX-52, Pioneer Elite BDP-52FD, Vienna Acoustics Bach Grands, Vienna Acoustics Theatro Grand, Wharfedale Diamond 9.2s, REL T-1 & Panasonic TC-P54S1