I use (and have done for a year now) a Relysis 15" TFT at home for business, imaging, net and Flightsims (which is about the only game I play - oh, apart from BVE trainsims, and GTA3 and a few others which my son's bought and installed!). I also use a 17"CRT in my office.
Of the two the TFT is far superior (even though this model is at the bottom end of the scale budgetwise) and I have no problems with games. The point about native resolution is important though - most 15" TFTs are set at 768x1032 which most games will accommodate. However 17" TFTs normally have a higher resolution (because the actual pixels are of the same size in a bigger screen area, I guess) which may be a problem.
I would go for TFT everytime - particularly with prices coming down as they are. The particular advantage that I've found (apart from reclaiming my desk) is that I have far less headaches than when using a CRT.