Any Campy 8 or 9s RD pre'01 will work if you don't want to go with 10 just yet. I picked up my 9s Chorus RD for about $50 off of ebay. I bid on a lot of them cheaper but none slipped through so I paid up. For your front you can use any old 8,9, or 10s Campy. I've mixed and matched 'em all. You won't need to spend more than $15 shipped for one.
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