Parts sourcing

Hey I got one MF (soon to be two if the Ebay auctions go my way), and plan on doing some heavy expansion/case modding. I'm gonna try to put enough knobs/sliders on it so I can do it all with this custom controller and one turntable. Got the inspiration from that 4Midiloop controller video. $1300? Skrew that. How about $400 in MidiFighters and parts!

Thing is, I want some better quality stuff than the local Radio Shack. Any recommendations for electronic parts suppliers? I know where to get more Sanwa buttons. It's the knobs, sliders, and case modding stuff I'm looking for. Any suggestions? Ideally casewise I'd like it to be the same height as your average turntable so they'll be level with each other.

http://www.sparkfun.com