The following is a good debate between Matt Slick (Reformed) and Steve Gregg (Arminian). I think that, while Slick did a good job at presenting the Reformed perspective on the relevant texts and issues, Gregg did a better job of showing how unbiblical Calvinism is.
Calvinism Debate - Matt Slick vs Steve Gregg
Calvinism Debate - Matt Slick vs Steve Gregg