Which E320 to buy?

Hi, I'm new to this board and wanted to ask everyone a question or 2. My girlfriend is in the market for a used Mercedes and is looking at the C and E series, specifically the E320 and C320. I want her to get the E because it's roomier and seems to ride smoother than the C. She has a budget of no more than $25,000 to spend and we have looked at 1999 and 2000 year models in the E's. We read somewhere that 1999s were better years to buy than 2000 but I don't know what that was based on. Is $25,000 realistic for a 1999 or 2000 E320 and were there issues with the 2000 model E320 vs 1999?
Thanks

1999 Mercedes-Benz E320 for sale by owner

78,940 miles. Very Clean, runs perfect. Midnight blue exterior with tan leather interior

ONLY $17,650!!! MUST SELL!!

I am in Des Moines, IA. You are free to fly/drive to Des Moines and inspect the car before you buy!! It is in perfect condition with no known problems. Exterior/interior is in excellent condition (with minor scratches).

The car is fully loaded and has all featuers like Air Conditioning; HEATED SEATS, Alarm System; AM/FM/Cassette Audio System; BOSE sound system, 10 disc CD changer, Antilock Brakes; Automatic 4-Speed Transmission; Cruise Control; Fog Lights; Headlight Washers; Leather Seats; Leather Steering Wheel; Power Antenna; Power Brakes;
Power Door Locks; Power Seats; Power Steering; Power Sunroof/moonroof ; Power Windows and many more.

Please email me for any additional questions or photos.

A good way to to check prices in your area is use autotrader.com.