I know you’re probably hung up on used, but you might consider a left over new 2016 model that’s still on the lot.
Often times, the dealership will charge as much, if not more, for a used 1~3 year old used car- which is what you’re looking at- if you look at all the numbers. If you’re financing the car, you can usually get a better interest rate on new vs used.
That said, since you’re looking at the Fit, your other options include the Ford Fiesta or Focus hatchback, the Mazda 2 or 3 hatch, Chevy Sonic, Scion xB, Hyundai Accent, Toyota Matrix. Any of those should provide you with several years of reliable transportation.
You might also look into renting one for a weekend to see how you like it longer term vs a dealership test drive.