whats the value of my digital audio G4

Is the monitor at least a 20" LCD? If it's still a CRT the whole thing isn't worth much more than $200 if you're lucky. If it's an LCD monitor, the monitor may be worth more than the CPU. I've got a 733 D/A with 1.5GB RAM, 10.4.11, 2 x 120GB HDDs, a new DVD-rom optical drive, USB 2.0 IDE card, and I wouldn't ask more than $300 for it.
I may even be optimistic here.

Sorry...

All threads offering items for sale or trade, asking to buy items, or asking for pricing advice on items to be sold must be posted in the Marketplace forum and are subject to these rules. Members not eligible for the Marketplace forum may not start threads for such purposes.

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As you are not eligible to post in our Marketplace, you are also not eligible to place feelers or ask for pricing guidance on your sale at MR.

I would advise doing some searches for previous sales and also logging into eBay -- once you log into your account, you will be able to search closed listings and so you can see prices that resulted in successful eBay auctions. While you are not eligible to sell here at this time, typically you can expect that forum sales will net 80-90% of the prices seen on eBay (inclusive of shipping in both cases).

Good luck.