Display or...
I'm quite satisfied w/my current speakers, sub, amplification and sources, having upgraded/added these to the mix w/in the past couple of years, so this would only leave a video display and processor/receiver for improvement.
While I chose video display, it actually may be a processor/receiver. While I'm very happy with my Yamaha RX-V2500, I may look in the future to improve my 2 channel listening, so this is a possibility. Other than that, I would at some point like to move from a RPTV (also which I'm pretty happy with at this point) to a projector. With the way the prices of these are coming down and the quality and lifespan of many models are improving, it's a distinct possibility as well.
Unfortunately, all of this hinges on the WAF for spenditures, so I may be laying a bit low on my purchases.... for now...
-TD
ps
QS8s and M3s were the latest in my rear surround speaker upgrade and I couldn't be happier...