Yeah I would just go with the PS3 , since it is upgradeable friendly compared to most standalone players. You can get a remote for it here
PlayStation 3 Blu Wave Remote.
If your SXRD is 1080P you'll see the benefits of Blu ray. If it is not..you'll still have a great picture. It will be just short a million pixels or so in resolution. Which does make a difference.
You can pick up a decent 1.3 HDMI from www.monoprice.com. It will do everything you need.
If you need to run the cable over long distances and the spaces to where your PJ is mounted are tight or your processor/receiver are in a confined location . You can use CAT5 cable and HDMI extenders. They'll convert the signal over the CAT5 and then reconvert it back before it goes into your PJ. You can run HDMI up to 150 ft or so this way without any loss in sound or picture quality.
I've seen a few SXRDs hooked to Denon Blu ray players. The picture quality is breathtaking. I doubt you'd see a major difference if any using the PS3 on the other hand.
I would save that money for a new PJ, if your current unit isn't 1080P and for Blu Ray rentals or purchases. ;-)
By the way, for the ones that haven't seen "Band of Brothers" on Blu Ray...WHAT ARE YOU WAITING FOR???
Watching this movie on a full 1080P display is like watching a live play through a window! Definitely one of the best PQs and sound I've seen or heard from Blu Ray.