Spirit and Opportunity. Time for a second production run.

http://www.aviationnow.com/avnow/new...?id=news%2F110
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See this story. Given their success, why not send some more of essentially the
same model? With just minor improvements design costs will be minimal, and they
can learn from their mistakes.

Send a half dozen to other perspective sites, that can be more challenging.
losses can be expected, but big returns are possible from very rough terrain.

Now go ahead with newer models.... but why ditch what proves to be a excellent
design?

Personally I would like to see a rover visit some previous landing sites.