National Semiconductor is great aren't they? Also, buy from Digikey. Super cheap, and very fast shipping. I've been making amps(guitar, bass, line, stereo, headphone) and effects (rack and stompbox) for a couple years now. My most recent project was remaking a Fender Princeton(6v6GT power tube). If you have any more questions, I could probably help out.
I'll be buying the PCBs and basic components to populate them from www.audiosector.com, and extra parts (binding posts, standoffs, and the like) will be coming from www.partsexpress.com. Digikey has a huge selection, but I don't think there is anything I'd need to order from them for this project.