What else should I consider, open top/conv. that can seat at 2 adults+2 kids?

Hey all. I was looking for an around town commuter that meets the following criteria:

  1. Some sort of open roof/convertible top car as the weather is pretty great where I am

  2. Has a manual transmission

  3. Does not require premium fuel, and is capable of roughly ~30mpg HWY

  4. Preferably Readily available in the market place and can be regularly found with 50k-75k miles on the clock

I currently have a full-size and mid-size truck, a C6, and a 4th gen convertible T/A. Ideally, I would like to consolidate the Ridgeline and the T/A into just one vehicle as both of them are pretty much used as commuters at this point. I was looking at a late 5th Gen Camaro with a V6/6spd, a '13/14 Mustang V6/6spd, or a maybe a Sahara Wrangler with the standard V6/6spd power plant.

Is there anything else out there that I am missing? I am sure there is but I just keep drawing a blank on it. Thanks in advance all, I know there will probably be some obvious solution that someone will point out!