Need Advice - buying used Gen 3

I am currently trying to sell my 208 Honda CRV EX and looking at a Gen 3 Prius to get in its place. So far I have 3 cars I'm really interested but am having a hard time choosing. I am wanting to get $7k for my current car (either trade in or Craigslist) and wanting to keep my budget no more than $15k. I will be having to take out a loan for whatever car I decided. There aren't too many Prius in my area at the dealerships, so right now I have only found ones in my price range on Craigslist.
The first one I'm most interested in is a 2015 Prius Two with 37000 miles, asking $15k (Craigslst). The second one is 2014 Prius Two with 50000 miles. She is moving and trying to find someone to move the loan over to, about $14500 left. The last is a 2011 Prius with 58000 miles, asking $11k. I'm not too sure the trim on this one, but there is a screen inside so I'm guessing four?
In general, I was wondering if one seemed like a better deal than another or if there were certain years/problems to watch out for.
There is a 2010 Prius III at a dealership here for $12k with 32000 miles, but I heard this was a bad year in regards to oil consumption and I was also warned that an older car with less miles might mean it was sitting for a while and to avoid that.

Any help would be great!