In reply to neon:
> chocolate mountain definitely on list. will be renamed the chocolate hill when i leave
That's the essential point covered, then! (I'd second the recommendation, by the way...)
For the minor issue of actual rock-and-mud hills, I reckon a good off-the-top-of-my-head circular itinerary of obvious classics would be:
Lochnagar
Braeriach
Ben Wyvis (on a clear day)
Foinaven
Quinag
Beinn Alligin
Bruach na Frithe
South Shiel Ridge (or part of it)
Ben Nevis
Buachaille Etive Mor
Plus probably somewhere in the W Highlands, but I don't really know the area.
On the other hand, better advice might be to pick one area to do in more depth with less driving, and come back for the others later!