I'm looking to get a headphone/mic combo for use on my Mac Pro, but in doing my preliminary research, I see references to people saying you have to have a mac-compatible one that plugs in via USB. Is this the case? Can I not just get a headset that has both a headphone plug and mic plug to use? I'm planning to use it over Skype and checked their site for info on a mac-compatible headset but they don't mention if they are or not. I want something really basic and simple, and this one looks like one I'd be interested in (though I'd buy elsewhere to save a couple bucks. Normally I would have assumed that any regular headset would work, but I seem to remember seeing some kind of mention about the input jack not being a normal input and needing some kind of pre-amp, so the best option is to go USB? Can someone shed some light on this and offer up a good suggestion for a cheap headset that will work? I see some for $40 or $50, but don't want to put that kind of money into it.