I plan on upgrading soon from my terrible '06 Chrysler Sebring. I have done some research on used cars around $20-$23k and the C300 is my #1. The interior is great, the handling is amazing, and the reviews of the car are glowing. However, I want to know if any of you have words of advice for me before I go looking for the C300?

My goal is to find one with around 20k-30k miles for around $20k, I am in no rush so I am confident I can find one if I look hard/long enough. Also, AWD/4MATIC is a must in my area.

- Is there a specific year that is known to have reliability issues or be extremely reliable? Reliability is definitely one of my higher focuses.

- To my knowledge, there are two trims -- Sport, Luxury. The only performance difference is the sport vs. luxury suspension -- how noticeable of a difference is this?

- I am leaning more toward recent-year models (2013, 2012, 2011), what are the primary interior/exterior/performance differences over the years? Are they substantial enough to warrant paying a significant higher price?

- I like navigation and backup camera -- is there anything I should know about either feature's performance? Were they more prevalent or better in certain years? Do all cars with navigation also have backup camera?