It depends on the content of the disc, and I'm not familiar with the rest of hum's work. If it's a documentary that was originally NTSC and (somehow) got converted to PAL and that was the source for the disc, I'd recommend converting back to NTSC rather than going up to HD, which would be using a sledgehammer to crack a nut. Personally, I'd take a true original-PAL->NTSC conversion over a PAL->HD upscale.

The difference in picture resolution, which in HD has at least been more-or-less standardised to 720p or 1080i, was never much of a problem. The biggy is the frame rate, and we're still shooting and broadcasting in 25p/50i over here (it might be that movie channels are doing 23.976/24p, but I don't know). I think it'll be a long time before we see the back of PAL speedup (though at least some broadcasters/DVDs are now resampling the audio with minimal artifacts).

DE