My wife got a 2004 Sonata V-6 auto with all the goodies, and we have put
about 12k miles on it.  No problems have been encountered to date.  I
find overall performance on the highway somewhat above average for a car
of its size/weight and it gives a real solid ride.  We are comfortable
with the warranty and our local dealer has a good reputation in the
area. The Sonata looks good too !

This past October I traded a 2003 Corolla for a 2005 'Lantra GT.  I use
it to commute about 250 miles per week, with a combination of highway
and city driving.  This one is going to be a keeper.  Fuel economy may
not be the best in its class, but I find that an acceptable trade-off
for a little edge in performance.  IMHO this was a good trade - the
Corolla is over priced and somewhat stingy on performance and interior
space compared to the Elantra.