Real glass is so much nicer than plastic for a party (not to mention better for the environment). Why not choose the favored glass of French bistros: the Duralex Picardie Glass. Designed in 1927, the style remains unchanged and is a staple in most French households. Plus the special tempered glass keeps them smash resistant (I can personally attest to that) which is perfect for that soirée you've got planned.
I like to the heft they have in your hand. Especially when you serve red wine or hot tea (or hot apple cider) in them. It's unexpected and classic.