Depends on whether you're talking e90 or e92. If you like the facelift coming out for the e90 then wait a lil bit. If not, then you better hurry up and place an order soon. You don't have to worry about the e92 refresh for a good while. No reason to wait.
E92 335i: Space Grey|Coral Red|Aluminum Trim
Hold out for the BRZ STI or... Rocket Bunny FRS.