I spent a lot of time to compare most of the popular 12.1" panels on the market which are fitting to the (very small) housing of the S21T.
The thickness is the greatest problem by the best LCDs including touch screens you can buy at the moment.
All of them have the same resolution (1280x800), but the LCD I built in have a contrast ratio of 1200:1 and black is black, not grey like the built in LCDs.
The AUO and the Samsung panels which were original built in by OrigenAE are very bad.
So I was looking for a separate LCD and touch screen and found it from a manufacturer and producer in Hong Kong (http://www.alibaba.com).
The LCD which I built in is the "BOE EV121WXM-N10-1850" and the capacitive touch screen was called "LH12007B".
The controller board for the LCD is the "JZ-VDH58L" with IR controller board and keypad.
To put this parts in the housing of the OrigenAE S21T you have to make many modifications:
1.: you have to produce a new cable which connects the S21T power supply board to the new LCD controller board with all JST-connectors.
2.: the LCD and the touch screen is a little bit to big for the housing, so you have to rework it at a milling machine.
3.: the keypad is to big and you have to grind it, than you have to make a new faceplate with the right holes for the buttons at the right side of the LCD housing.
As you can see, you have to spend a lot of time (and money also) to make this case up to date :).