You don't indicate where you are located, so it's a bit difficult to say if these are good deals or not. Here in western canuckistan, those prices would be considered pretty fair. As far as the bikes are concerned, they are both from about the same era when aluminum bikes were becoming commonplace but still had some issues to work out - they rode pretty rough and many frames developed cracks.

I would give them a ride and a careful look. The cannondale is (obviously) the better deal, but if you get the klein ditch that abomination of a saddle.