The only differences I've been able to find between GT2000 & GT2000X are the better bearing, plinth, and tonearm in the latter. This has also been confirmed by someone who has worked on both. The platter and motor as well as the motor controller appear to be the same. GT2000X usually sells for multiples of GT2000.
That gunmetal platter weighs 18kg and usually goes for more than the turntable itself. Here's one for sale:
http://page6.auctions.yahoo.co.jp/jp/auction/f174978328
The metal frame that lewm mentioned was an optional accessory that appears very rarely on the used market. Here is a current replica of it, though in gunmetal rather than cast iron:
http://www.ne.jp/asahi/y31/pro/y31ab1/phot.htm
All the other original options are briefly explained here:
http://audio-heritage.jp/YAMAHA/player/gt-2000.html
That gunmetal platter weighs 18kg and usually goes for more than the turntable itself. Here's one for sale:
http://page6.auctions.yahoo.co.jp/jp/auction/f174978328
The metal frame that lewm mentioned was an optional accessory that appears very rarely on the used market. Here is a current replica of it, though in gunmetal rather than cast iron:
http://www.ne.jp/asahi/y31/pro/y31ab1/phot.htm
All the other original options are briefly explained here:
http://audio-heritage.jp/YAMAHA/player/gt-2000.html