A mint, fully restored 500C sold for $1000-1200 (I forget the exact number) from pacificstereo a month or two ago. Really nice stuff can pull in stupid numbers. I was unaware that some Garrard tables were worth that much. Kinda makes me curious which one my grandmother's is.
[edit]: You know, I'm seeing Garrard 301s on ebay in the $1000-2000+ range, so I would keep the table. And my grandmother's is definitely not that one.