I've got the Topeak Aero Wedge. It's bigger than it looks in the picture and fits a tube, levers, 15mm box wrench, mini-pump, patch kit, multitool and pitlock key comfortably. The clip is kind of cool, but it definitely looks ugly w/o the bag on it and the bag shape is a little funky to begin with.
On my new bike I'm giving the Fiziki Aliante a try didn't/haven't move the clip over from my Toupe and I'm just using the smallest Lone Peak seatbag which fits everything except the minipump. I kind of like it better.