Need a new mobo, on a budget

Hello, I've been OCing my cpu recently and found that my mobo is seriously holding up my system (MSI NF725GM-P43 http://us.msi.com/product/mb/NF725GM-P43.html ).

I've been going back and forth between:

ASRock 970 EXTREME3
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

BIOSTAR TA990FXE AM3+
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


I'm looking at these primarily because they also come with an extra 8GB of RAM (40$ value). The biostar is almost 50 bucks more, and I'm not sure what I'm really getting with that money. I am looking to OC the ram, gpu, and cpu. is the 990 chipset worth the extra 45 bucks?

my system:
CPU: AMD Phenom II x4 970 3900 @ 1.4500v
CPU Cooler: Cooler Master 212 EVO
Mobo: MSI NF725GM-P43
RAM: 2x 4gb Crucial Ballistix Sport DDR3
PSU: PC Power and Cooling Silencer mk II 750w
GPU: Gigabyte Radeon 7870 2gb
Monitor: ASUS VS248H-P Black 24\\\" 2ms
Case: Antec 300 Blacksteel Mid Tower
Extras:
Scythe KM04-BK Kaze Master Pro Ace Fan Controller