My wife and I both have Fully desks, which are now part of the Herman Miller family (but weren't at the time we bought them). Not the cutest designs ever, but they've both held up well, and I think the bamboo/wood-ish desktop finish is nicer looking than similar models from other brands.

I've also seen a few places (including IKEA?) sell bring-your-own-top adjustable desks, where they provide the legs and motor and skeleton and then you add some kind of slab of your choosing as the desktop. Haven't tried one myself, though.