It's my understanding that being of "Energy Star" compliance was far more a label to slap on the box to garner approval of economics and boastfulness. IIRC the specs the Energy Star people demanded could be manipulated in interesting ways somewhat like the marketing department does for computer monitors and TVs in general.

In all likely hood the fact it's an Energy Star complaint screen won't affect it's performance. For sound though I always recommend you use a separate stereo system, nothing ever sounds good built into a TV.

Now if you wanted to be REALLY anally retentive you could try to find one of the handful of SCART capable TVs in the US and RGB mod every console you have. There is a certain type of screen used in the broadcasting industry that readily accepts RGB but the name of it escapes me at the moment. Check out an arcade screen then go look at s-video or composite, you'll never look at screens quite the same way again and will forever have SCART envy.