Intel.. SX recognises it uppon the first time u run it... but it should make a huge difference really!
Soundcard.. if u don't need loads of in out .. GET RME 9632 .. it's fuc*ing cheap for it's pro quality!!!!
1 Gb ram is a must for audio in todays world! ;)
Video... go with Mark, he know's the score!!
DIsable the ethernet port it messes with some usb audio/ midi devices at times!
Z