DVD upscaling: Sony BDP-S350 compared to PS3 vs. S560

[skatalite]

I currently have a BDP-S350 and a 42-inch 720p Samsung plasma. In September, I'll be getting a 50-inch 1080p Samsung plasma and a new BD player. Question I have is which would execute upscaling the best, especially in relation to the larger, higher-def screen I'll be watching movies on?

- With the PS3 Slim coming out, the lower price point and bitstream/decoding options make it a solid contender. I've read the upscaling isn't the best, but this always seems to be compared to the Oppo. Too bad I don't care for some of the Oppo's features, or else I'd be game for the $500 player.

- The S560 is a new BD player, so it might be hard to talk about its upscaling efforts. But if anyone has input, I'm open ears.

- On my 42-inch 720p plasma, the S350 does beautifully with upscaling. I sit roughly 5 to 6 feet away from the screen. "Sweeney Todd" upscaled looks surprisingly stunning.

So, for a 50-inch 1080 plasma, from 5 five away, would a PS3's or S560's upscaling be just as good, if not better, as what I'm getting with my current setup? And, which device would win out: The PS3 or the S560?

Thanks!