I have a 19" TFT with a native resolution of 1280x1024 which is really nice to play Amiga games on. I use it for many years now, so I can not remember for sure if it is a big difference to use a CRT. Nearly all my friends use TFT's for gaming (some also for emu's
) and except the very cheap one I heard no complains about them. A widescreen display could be a bit more difficult to adjust to display Amiga games properly though.