Better Motherboard for my build

Hello, I was wondering which of these three motherboards is the best.

GIGABYTE GA-MA770-UD3 AM2+/AM2 AMD 770 ATX AMD Motherboard - This is what I'm thinking of getting now
ASUS M3A78-CM AM2+/AM2 AMD 780V Micro ATX AMD Motherboard
GIGABYTE GA-MA78GPM-UD2H AM3/AM2+/AM2 AMD 780G HDMI Micro ATX AMD Motherboard

If you have any better motherboards in mind, please tell me.

This is my build that's gonna go with the motherboard:

AMD Phenom II X4 940 Deneb 3.0GHz Socket AM2+ 125W Quad-Core Black Edition Processor Model HDZ940XCGIBOX
SAPPHIRE 100258-1GHDMI Radeon HD 4850 1GB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card
OCZ Vista Upgrade 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model OCZ2VU8004GK
Western Digital Caviar SE WD3200AAJS 320GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive
COOLER MASTER Centurion 5 CAC-T05-UB Black /Blue Aluminum Bezel , SECC Chassis ATX Mid Tower Computer Case
Sony Optiarc 24X DVD/CD Rewritable Drive Black SATA Model AD-7240S-0B

My budget is $500, the 3 motherboards that I selected is in the Phenom II & combo list to fit my budget

Thank you