That's the price I paid for my two LED-P's a month ago. The Blade has built in speakers which mine doesn't have.
I would definitely recommend one!
I'm not sure what this AD board is referring to. I never had to research such a thing.
The PSU (Welltronics) is pretty good, mine doesn't get too hot and it hasn't failed once. It works at both 230V (UK) and 110V (US) so you don't need to do anything.
The adapter plug is very cheap and my monitor would keep turning on and off when I knocked it, most probably a dodgy termination inside the adapter.
I simply used a UK kettle lead instead. You will be able to simply swap the EU lead and adapter for a standard US kettle lead that plugs directly into the Welltronics power brick. I recommend doing this rather than using the low quality adapter.
So no you don't need to buy another power brick, but I do recommend replacing the supplied lead for a US kettle lead so that you don't need to use the adapter.
I hope this helps.
It's worth noting that most documented Crossover purchases came with a Dual Link DVI cable, so there's no need to purchase one of those either.
Some people have had issues with the supplied cable but mine work perfectly.Edited by IcedEarth - 9/23/12 at 9:20am