Are you talking about good PV?? Then I'm sorry but I NEED in my life some ballad pv simple but f*** awesome such as HEAVEN or ZUTTO. For me the first one is simple but incredible. The second one is BEAUTIFUL to watch. It doesn't have to be expensive to be EPIC!
EDIT: I also love Sweet Scar. It's just Ayu singing but telling a love story while moving around a house. Ah... great concept.