Drac,
Throughout these threads you'll find the discussions of which tartan to wear and why. It usually breaks down like this:

-ONLY wear the tartan for your surname/clan/military branch etc.
-Wear tartans for which you have some ancestral 'tie' to (tie being described as anything from surname, kinship, to 'I think we're from there", to "I once visited there")
-Wear what you like--know what you wear and why
-Wear what you like

If you've chosen to go the 'universal' route, you have a plethora of options! If you choose to honor any Scottish ancestry you have no matter how slim--try tartans like "Pride of Scotland", "Scotland's National" etc.

Check out the websites of those that advertise here and see which universal's appeal to you.

You'll get tons of advice from folks telling you what they think. In the end, its all up to you. Happy hunting!