[H] DDR2

[Winterlight]

I am planning a new quad core build soon. The board I am thinking 
about uses DDR2 = Asus P5E3 PRO I see Newegg has special DDR2 prices 
with rebates.

CORSAIR 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual 
Channel ... - Retail
 DDR2 800 (PC2 6400)  for under a 100 bucks after rebates. This 
doesn't appear to be an unusual price as they have other brands at 
similar deals.

Is this the fastest DDR2 speed available .... is there any reason I 
want to pay the crazy price for DDR3? Thanks