Well, for logical arguments, Thomas Sowell is a good place to start. He's got almost all of his syndicated column online, and it's easy to find. Going back from there, you can find lots of videos and lecture transcripts of Milton Friedman. These two are older, but the principles apply today.
If you're browsing YouTube, one of my favorites was Lee Doran, though he typically only posts videos talking about current news stories that aren't of interest to me recently. His videos countering some of the bullshit videos that made the rounds of Facebook a few years back are golden, though. Following that thread, you can eventually find videos by LearnLiberty, which are great, short, and concise.
You basically want to stay away from Bible thumpers and focus on raw economics. Economics is a science, and it's theories are supported by experimental data like any science. This information, and these facts, are your best tool. When I'm in a heated argument I can typically find that economic theory backs me up, and there isn't a great counter to facts.
Also I accidentally reported your post