If you were wanting a set of wrenches that will attack both metric and standard Metrinch are pretty good.
http://www.metrinch-tools.com/website/dealers.php?subnr=2

I would still say look around and just get the tools you need.
I know I tend to load up on gear to much and end up with items that only get used once in a blue moon.

I assume you have a glass hull. So do you have any patches for it?
How about emergency plugs, inner tubes and hose clamps in case a through hull decides to let go?

Again on the nuts and bolts, spares for the ones most likely to get stripped or lost.

A bit of coarse sand paper too.

I guess having a hacksaw would be too obvious to suggest, so how about a hammer.