I used
LowestFare.com to fly
round-trip,
direct flight, on a VERY
reputable airline (Lauda, a part of Lufthansa) from Miami Florida to Munich Germany for
$380!
I highly recommend LowestFare.
Here's a couple of tricks:
Stay through the weekend.
Try not to stay longer than 30 days. Dropping my vacation time from 31 days to 29 days immediately dropped the price $400.
Try to fly on Mondays. Mondays aren't heavy travel times, and therefore airlines like to give incentive to get out on those days.