I've gone from a quality Viewsonic 19" CRT (Diamondtron aperture grille - same tube as your Iiyama) to a Dell 20" widescreen TFT, and I'm satisfied with the switch overall. There are some areas in which TFTs can't match CRT - like black depth (the biggie IMO), contrast, repsonse time, non-native resolutions, available refresh rates etc, but overall I'm happy with the results.
Widescreen gaming is very nice too. Plus TFTs do have their advantages, like desk space, power usage, brightness, being flicker free, looking nice (the designs), being better for your eyes, sharpness in native res etc. I wouldn't have the CRT back.
Having said all that I'm still eagerly awaiting SED so I can ditch LCD for good and get contrast, black depth, CRT like responsiveness and high refresh rates.