[Obsidian Dragon]

You might consider looking at interfaces that have more I/O. Maybe you don't need them today but at some point you might. If you're investing in a MacPro, then you are probably looking for an expandible system and more I/O is a good investment. Often people who get a 2 input interface run ou of inputs as soon as they try to track drums or a small band. The interface may cost more in total but actually cost less per channel of input.