For the price we have been satisfied with the Spin Doctor from Performance. It isn't the cheapest one, I think the one that is around $120-150? It folds up pretty nicely, clamps well. There are sweet Park ones but they were double or triple the price and DH received this as a gift.
Amanda
2011 Specialized Epic Comp 29er | Specialized Phenom | "Marie Laveau"
2007 Cannondale Synapse Carbon Road | Selle Italia Lady Gel Flow | "Miranda"
You don't have to be great to get started, but you do have to get started to be great. -Lee J. Colan