Whats the difference?

Well higher the multiplier is, better option you have for reaching maximum overclock.

Lets say your system can do maximum 300htt

then following is what you could maximum get on each c.p.u if you have the right cooling.

Opteron 148 = 300 x 11 = 3300mhz

Opteron 146 = 300 x 10 = 3000mhz

Opteron 144 = 300 x 9 = 2700mhz

So like Kempez have said Opteron 146 is better option here :D
 
I can vouch for the 146, anything higher isn't worth the price difference, and anything lower won't give you that uber special x10 multi ;)
 
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