Unless you can find out the complete stepping of the 0609, not really much to say. According to http://www.xtremesystems.org/forums/...ad.php?t=96900

CCBWE 0550UPMW (Some are crappy actually) is 3g
CCB1E 0609FPAW is also 3g
CCBWE 0609FPAW is 'Unconfirmed precise averages, but seems to be 2.8-2.9'

So you could go with 0550 and get the some that are crappy (bad) or the 3g ones (good). Or you could go with 0609FPAW CCBWE (bad) or CCB1E (good) or something that may be worse or better...