Uhm... If you can sacrifice some Mhz and do some undervolting, you might not need a new MoBo.
If that's not the case, then any AM3+ based MoBo that explicitly says "125W CPU support" somewhere is fine.
The ones that are on top of my head are the Asus Sabertooth and Crosshair Formula series (790FX, 890FX and 990FX chipsets). Well, most full ATX MoBos should, actually.
Cheers!