K Dog, I tired heaps of different ones when I started out and finally stuck with a Neil Pryde one. Most seem to work if you use a seat harness, but with a waist harness you need one with a cut out so it doesn't keep jamming the vest up into your neck. The pryde one is light and easy to get on and off and has pockets to keep keys, spare downhaul line, flares, EPERB, rubber life raft, well you get the picture

Check out the Pryde one here:
http://www.neilprydewaterwear.com/index.php?option=com_content&view=article&id=265:high-hook-ce&catid=73:vests&Itemid=189