Yesterday I ordered a BP6 but can't figure out what cpus i should buy? Should i go for the stable c366 or is the newer c433, c466, c500 more overclockable?

Right now I have a BX6 with a nice c333 o/c to 560Mhz with dual-peltier an a huge heatsink.

So if there is any1 that can tell me what cpus to buy, i would be happy!