There will be a massive price cut scheduled for late April. On the 22nd Intel plans to cut Core 2 Duo E6700 price from current $530 to $316.

The Core 2 duo E6600 clocked at 2.4 GHz will drop from $316 to $224. E6420 and E6400 both clocked at 2.13 GHz drop from $224 to $183. E6420 is a new CPU and will have 4MB of cache while 6400 remains at 2 MB only.  

Core 2 duo E6320 CPU clocked at 1.86 with 4 MB cache will enter the market at $163 while E6300 will drop from $183 to $163.  
 

Core 2 Duo E4400 clocked at 2 GHz and FSB 800 will start selling the same day for $133 while the currently selling E4300 at 1.8 GHz will drop from current $163 to $113.