C64's, Paddles, Music Keyboard, & Power Supplies

[XDelusion]

First off, I'd like to know where I can score a working C64 for cheap? Also what is the best model? The first or second? I know I've seen 5 old models die, but I've only had 1 newer model.

 Second off do I need C64 padels, or will my old Atari 2600 paddles work?

 Where can I find a music keyboard overlay for the C64, are they cheap?

 How do I build a C64 power supply out of a PC power pack? Will my hacked 1200 one work?

 P.S. I know about ebay, so please don't say Ebay. Thankx!

[XDelusion]

I found the answer to one of the questions in case anyone was curious:
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Atari paddles will work, but Commodore paddles are better. The
resistor values are different, so the Atari paddles end up being much
more sensitive -- it only takes a very small amount of turning to
sweep the entire range of the filter. The Commodore paddle is less
sensitive and the range is comparable to a normal filter cutoff knob.