Intels socket 2011 is probably your choice for consumer motherboards and processors .
A build like this is about as cpu and RAM intensive as you can buy in consumer channels .http://pcpartpicker.com/p/2nlfu
I deliberately did not include extra storage , or a sound card . The sound card particularly is not an item I know enoughl about for your usage .
Yes you want USB 3 . Firewire is a dead end technology and hard to find at all . Some devices support "thunderbolt"but its rare and may or may not catch on since USB is just as fast as current implementations and improving all the time
EDIT : use this cpu cooler instead . It will help cool the motherboard and RAM and is very quiet http://www.newegg.com/Product/Product.aspx?Item=N82E16835608019
For some reason I could not find it listed on the pcpartpciker site