lamegamer

Someone Please Help :)

Heya. I have lots of questions but I'll try to keep them clear and this post short. I REALLY appreciate anyone willing to give advice.

I'm a PC user, new to Macs, and I'm about to buy a Mac Pro. Here is the equipment I need to chain up to my computer:

A Yamaha EX5 keyboard (which I'll be using strictly as a midi controller)
Pioneer DJM 300-S mixer (with my two Technics turntables)

I'm considering buying a M-Audio FireWire 410 Audio Interface ( http://www.m-audio.com/products/en_us/FireWire410-main.html ) to use to connect all of that to my computer.

For speakers, I'm looking at a set of M-Audio BX5a ( http://www.m-audio.com/products/en_us/Stud...eBX5a-main.html ) and, because I've heard those have overpowering high ends, a SBX Subwoofer ( http://www.ramelectronics.net/html/studiophile-sbx.html ).

I'll be using Logic, Reason, Garage Band, etc. to do my sequencing and composition. 95% of the time I'll be using this system to create music or record vinyl. Ocasionally, I may be recording live instruments with a mic or guitar thru the XLR imputs.
Okay, so now the questions. I know turntables, I know computers, I know music... But I don't know jack about Macs, external sound cards, or speakers in general:

1. Can I hook those speakers directly to the FireWire 410? If so, how do you hook all three up b/c I see the "direct outputs" on the back, but how do you determine which speakers get hooked where? Or, do you just hook the subwoofer up and then the two monitors get hooked to the sub?
2. Am I able to hook my turntable mixer up to the FireWire 410 so I can record my vinyl mixes?
3. Does this look like a good setup overall or should I go for something like a set of 5.1 logitech speakers which look like you can hook them optically to the FireWire 410?

I really appreciate any and all responses and help that people can give me. Thanks a bunch!