I went with the Carradice Bike Bureau. The aesthetic is good for my workplace and it easily holds my office clothes, shoes, and shaving kit. The clincher for me was that it's made of waterproof cotton duck and comes with a laptop insert. It also comes with a shoulder strap that works great when the bag isn't overly full. Different story when it's packed with clothes and gear....it gets bulky and uncomfortable (but still works great as a pannier).
http://www.carradice.co.uk/index.php...&product_id=64