It's hard for me to offer recommendations because so many cars fit your criteria.
What size car are you looking for?
Which cars do you find attractive?
Sales of compact and midsize sedans have been sluggish, so you can probably get a fairly new car for $15,000.
The 2014-2015 Mazda6 could be a good fit. It looks bad in our reliability stats lately, but this is due to two common but minor problems with the door seals (many have been replaced due to excessive wind noise) and the Bluetooth module.
The 2015 Hyundai Sonata is a much better car than earlier Sonatas, and quite a few are already available in your price range.
If you don't need a car as large as these, you'll have even more to choose or get a car with more features from among compacts such as teh Mazda3 (I much prefer the s, with the 2.5-liter engine), Hyundai Elantra GT (offered only as a hatchback, I'd get the 2014 and up, which has a larger engine), Kia Forte, or Buick Verano.
For detailed pros and cons of any of these, check my reviews on the site.