ATH-M50's or Custom One Pros? Arrrgh I can't decide, I'm sick of Astro's
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But the custom one pros are higher end headphones in a price sense. If you thought about it you would have to get a sound card for all of them. Not that you need a sound card to drive any of those headphones. They are more than fine without.
And if you are really worried about it just get one of these http://www.amazon.com/Fiio-E10-USB-Headphone-Amplifier/dp/B005VO7LG6 It's $75 and it works great. Most if not all would recommend that.