Innova Helios 380EX. Bought last summer. Like new condition - only used twice in freshwater lakes.
A great lake, ocean, or moderate whitewater (up to class III) rig. Comes with it's own storage backpack and detachable rudder.
Very packable - only weighs 35lbs. I loaded 2 4-piece kayak paddles (not included), pump, and other goodies into the pack for one of the trips as well.
See it at http://www.innovakayak.com/helios.htm
The green one with the rudder looks exactly like mine.
Lists for $699 + cost of rudder.
The first $550 takes it all.