Okay, I thought I'd post a visual representation of the suggested tartans that I have emailed to my friend in Australia:

Elliot Clan/Family Ancient


Roxburgh District


Border Reivers Check Modern


Scottish Borders Borderland Modern


Scottish Borders Dress Modern


I also sent links to the tweed examples found at the Scottish Tartan Museum site.

I hope he doesn't feel too overwhelmed by the choices
(...I personally think he should go with the Elliot Ancient above w/ the all red stripes).