I suspect you meant a maximum price of $8,000, not $80,000.
I don't know if you'll find the Elantra especially comfortable. It's probably not as smooth or as quiet as you're used to. Most likely you'll feel more comfortable in a car closer in size to your Century. Among mid-size sedans, the Ford Fusion and related Mercury Milan probably offer the best combination of reliability and value. Or maybe even the Lincoln MKZ.
Maybe a Hyundai Sonata or Kia Optima, but I'm a little leery of the pre-2011 cars' long-term reliability.