In order to give all this a try, without spending to much money on an external audio interface, I bought an http://www.rolandus.com/products/productdetails.aspx?ObjectId=733&ParentId=114. Combined with the internal sound card of my MacBook and proper headphones this gives me a low budget but fairly decent S2.0 experience. If you want something with a little more quality you might consider the http://www.rolandus.com/products/productdetails.aspx?ObjectId=704&ParentId=114 or http://www.rolandus.com/products/productdetails.aspx?ObjectId=731&ParentId=114. But maybe more experienced users can give you some insight on which audio interface will give you a good experience (low latency, high quality output) for a fair price. I’d be interested in this as well.