Wait if you can, the new model will likely come out late Summer or early Fall since the 65nm CPU shrink is delayed until Summer.
There won't be a price drop unless sales really slow down or they switch to the 65nm model to reduce cost. After that, they might cut by like $50 or something, which would put a Core 360 at the cost of a Wii (granted Core is absolute shit value for the money compared to Premium).