The LCD comes with an "egg" that regulates power already. You dont need extra regulation, just make sure you use it.
Get the regular M2, as I have no idea what the M2 HV is but the regular M2 is a good buy.
You may want to purchase a case. The Ampie/VoomPC cases are made for the itx boards and a M2 and a 2.5" drive. I found a case that accepts 3.5" drives before, but it was rather ugly. I use a 3.5" so it sort of limits case selection.