what size TV? What budget?
Plasmas generally offer better picture quality. The latest sony Bravia LCDs can beat plasmas (at the same price point).
Basically, if you want small - LCD. If you want big - plasma.
If you want the best PQ - CRT.
If you don't mind waiting - SED
If you don't mind waiting longer - OLED
If you're under 30 and in good health, may be worth waiting for laser...