LCD LED or PLASMA?

I'm very happy with my Vizio 42 LCD 1024 120 Hz.

Got it last year for $500, after lots of research. Just now starting to see this price for these features mainstream.
It has USB, 3x HDMI, and a nice selection of other inputs, and a relatively intuative menu, which is very important to me. I've seen lots of otherwise nice A/V equipment spoiled by an illogical interface, either on-screen, or on the remote.

FWIW, LCD/LED is just the backlight, nothing to do with picture quality.
(don't ask about CCFL vs EEFL)
Theoretically, LED should be cooler and use less energy.

Keep in mind that resolution is currently fixed at 1024 (or 720) lines.
Definately go for 1024 unless you get a 30 or smaller, and that at sizes larger than 50, you will start to see the lines or "pixel" squares, if you are close.
(a 40 has 1024 lines, and so does a 70, therefore, the lines are larger on the 70)