This is a question that just runs and runs.... Go to other less civil forums and people on both sides get quite heated by it.
The apparent sharpness of a TFT is a little bit of an illusion, they all have native resolutions- as they have the exact number of pixels for that resolution (eg mine has a native res of 1280x1024), if I run it outside that the screen has to scale the image to fit, resulting in blur.
I have a TFT, and won't be going back to CRT. They have got good enough for games, ghosting is still there - but it takes something like scrolling black text on a white backround (like these forums, when I use the scroll bar on the left and move it fast) or moving the mouse quickly. For games, I don't notice ghosting at all. Geometry is perfect, and they don't cause as much eyestrain. If you do any work that requires accurate colour rendition though, then they're not for you, as CRT's have them trounced in this area. CRT's also beat them in response time, a CRT has a response time less than 1ms. TFT's are improving in leaps and bounds though. TFT's are also small, and consume less power.
As you've got a Mitsu diamondtron, which is reckoned to be one of the best crts of recent years, I'd say stick with that!
But if you want to buy a TFT then go for one with DVI, 16ms response time or less (there are a couple of 8ms out now), and a proper named brand. Something you'll need to consider, is your pc good enough to play what you play at 1280x1024 which is the average 17inch TFT resolution. Bigger screens have bigger resolutions, and 15inch has 1024x768(normally).
Hope this has helped, my view is that you may be dissapointed moving from your display to a TFT. See if you can see a good one in action first, then make up your mind. Personally I love mine, and use it for gaming all the time.