Next week AMD is making a 'quick strike' by releasing Athlon II x4 'Propus' a month early. These are quad core procs in the $120/range.
BUT, the initial Athlon x4 Propus will be Deneb core and possibly unlock to Phenom Quads. The best way to tell (from what I have seen) is the wattage will be listed as 65-95w.
When the 'true' Propus comes out next month it will be a 45w quad.
Hard to recommend a mobo not knowing which way you may go with your CPU and RAMs. Intel will soon have 3 sockets available.
AMD has 2 sockets that are (sorta) inter-changeable.