I've used both, passive and amped. The only difference I saw was at the TV end. The signal at my PC really did'nt improve. Though the signal at my PC was damn clear with both passive and amped. Dont know why.
Claritys goona suck as soon as you compress your vids anyway, which you most likley will in order to show case on the net. Theres so many codecs that claim better compression and clarity, but I have'nt found any to work that great. I dont like using codecs anyways, once you start futzin around with them, you got to start explaing where to get the codec for others to view your file, and once people see they got to install somthin just to view, they'll say forget it.
Though I would definetiely reccomend adding an amplifier, just so your gaming does'nt degrade at the TV side.
In fact I'm revising my tutorial with an amplfier as a hardware method.