To be honest their 2007 Retrospectacle "Greatest Hits" collection is a really nice entrypoint. They are a band who were around for a little while and their sound changed. The first disk is their older stuff which has a softer jazzier balladic feel and the 2nd disk is more pop-rock/yacht-rock and is where you'll find The Logical Song and some other classics like Breakfast in America, Long Way Home and Goodbye Stranger.