I'm an old analog circuit designer and love analog circuits but practically I think that anything you can do in analog audio is audibly indisinguishable from the same thing in digital (provided the digital samping rate and number of amplitude bits is adequately high). Actually you can readily generate sounds with digital that are very difficult to generate with analog.
But if you have a philosophical preference for analog, then go for it, as long as you understand there's no particular technical advantage.
Regarding on-line electronic parts I like Digi-Key, Jameco, Mouser, and Parts Express(specialize in DIY audio parts).