Nothing wrong with the Sonota. Hyundai has been making quality cars for years. I would buy one in a heartbeat. I have been watching KIA that is now owned by Hyundai. KIA is a quality car and has been for years. So much so I purchased a 2010 Optima. It shares many parts with the Sonota. I love the thing. I joined the KIA forums for odd ball questions and to follow the track record for the newly designed KIA Optima. I'm interested in the longevity of the 2011 new design from ground up. First year redesignes usually are for beta testing if you get my drift. The 2.0T 274 hp four cylinder has my interest.
Anyway, join the Hyundai forums:
http://www.hyundai-forums.com/
Also:
https://www.myhyundai.com/
I'm certain you will get good service from the 2004 Sonota.