Looking at the XA30. Seems to be either NTSC or PAL. Is this still relevant for HD? Or is it just the 50 or 60 frames thing? I'm primarily working online. I'm in Oz which is PAL country but there's a $300.00 price difference between the two.

Or is it just the 50 or 60 frames thing?More or less. PAL models have 50/25p or i, NTSC have 60/30p or i and 24p. I'm in PAL land too, so I'm not sure whether the NTSC 24p is only for Cinema mode.

Is this still relevant for HD?

Still relevant for capture. If you shoot 30fps in PAL land you will get bars moving down your footage under some interior lighting conditions, often enough to be annoying. If you only shoot outside or with battery lights, doesn't matter. On-line display it's not relevant. Shop around for the PAL XA30, it's widely available for under AU$2000.