Re: PNY 6800GT
I used to own a PNY 6800GT! I don't recall mine coming with an external power cord, but it did have extra molex connectors, so yea, you're correct, just hook it up right to your PS and you'll be fine.
I never used the TV encoding capabilites so can't help you much there, sorry. $110 shipped ain't bad at all, I sold mine for $175 back in January.