None of the above,
Expect to run a 15" TFT with a Res of 1024 x 768, a 17" TFT with a Res of 1280 x 1024.
What matters is the response time. You want something at least 25ms and I personally do not buy a TFT unless it has a response time of at least 16ms.
If your Vid Card has a DVI Connector, then you want a TFT with a DVI Connector on it too. That way, you to do not need to have the Vid Card convert the Video from Digital to Analog to have the TFT convert it back to Digital again.
Take Care,
Richard