If you know of a cheaper site than airtech.com

[db3kfan]

to cross the atlantic, thatd be helpful too.

 

[RnJ]

I found my cheapest flight was with NWA, but they fly all over the place. It depends a lot on season too. Low seasons prices can be as much as half of what they're going to be from November to March when the demand is high. I found this places to have some suggestions, but don't really know your specifics:
http://www.travellerspoint.com/forum.cfm?thread=21223