Goldfish. Guppies won't survive the 50-55'F in the winter and Gambusia are being considered for listing as an "invasive species" in some States.
Comets or feeder goldfish would be your best bet. You can usually get them at a pet shop for about 10 for a dollar or two. I use them in my small ornatental ponds for that very reason.
Koi get too big, they can get up to 3 feet long and need good quality water with a high oxygen content which means adding an airator, and periodic water changes.
Tilapia, a South American cichlid, is also higher demand. You will need to feed them regularly.
No matter what you decide to go with, I would suggest partial water changes which can be done fairly easily by dipping out some water to water plants with and adding fresh to the troughs. The fish water will be a good natural fertilizer for the plants too.
Cheers.
Jim
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Tilapias are african cichlids... even if they are produced in masses in South America 
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