My opinion, most any kilt will do, properly accessorized. Here's shots from a couple of different years at the Alexandria VA Scottish Christmas Walk.
First one is a red & black (Rob Roy MacGregor) fileidh mohr.
http://img.photobucket.com/albums/v5...acNicholas.jpg
The next is a grey Stewart USA Kilt Philabeg
http://img.photobucket.com/albums/v5...1/webpost1.jpg
We're thinking about doing that event again this year. If so I'll likely go with the Irish American Stillwater.