I would hesitate to recommend a used boat without first seeing it. Condition can vary greatly depending on use and care. The '09 and newer boats have the current Drives (more durable than the earlier ones) and still come under the 2 year transferable warranty in case there are any undisclosed problems that you might discover after the purchase.
An older boat can be a great bargain though for the right price, especially if lightly used. Then too, you must consider what accessories (if any) are included with the price. A cart, Turbofins and large rudder are very nice additions and cost about $200 new.
You can read reviews on both boats here by using the search feature. Keep in mind that the Sport has a smaller size limitation -- you should be OK if under about 200# and 6'.
Personally I'd be a little wary about a rental boat in "fair" condition for $1200 -- sounds like it may be thrashed and certainly not afforded the came care a privately owned boat would usually get. At that price for that year model I would expect to find one in very good if not near new condition, if you're truly looking for a bargain! The '08 Sport with some accessories and a little bargaining may be your best deal -- should hold its value best if you decide to trade up later. Both models are lots of fun and great exercise.
