Bouzoukis 14

American makers developed the flat backed style of mandolin, Martin and Gibsons are the best known of these. 

Han's Irish Bouzouki Homepage.

The most important thing here (for all kinds of stringed instuments) is to make sure it's got a solid wood top. Instruments with a laminate top are only recommended if you're desperately short on money! This is rarely a problem when it comes to the Irish bouzouki though.