Which motherboard should I get for an AMD Phenom IIx4 975

This is the processor:

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

I use the MSI 890fx which might be in your price range, also asus sabertooth 990fx is in that range. Also the gigabyte 990fx is a little less and is also a good choice.

ASUS Sabertooth 990FX

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131736

I have this and a 980BE, great OC potential to 4.0Ghz.

That being said, for the kind of money we're talking you might want to go with a I5-2500K build.

How does it run on your MSI 890FX?
I actually have been looking at both, the Asus Sabertooth 990FX and the Gigabyte 990FX but just wanted to know which one would be best and if there was actually a better one than those, but they both look good.

If I was you, I would not go for amd at all. The future is intel. I know they cost more but that's why you have less problems with heating and other errors.

Since 2008 I am not using amd nor ati hardwares. With intel you have less problems.

Huh .. wtf. Heating / Errors?

Don't want to get into a debate here, but everything you just said is textbook definition of a fanboi. AMD's haven't "overheated" for over a decade, and I've ~never~ heard of "errors" happening in the entire time I've been building systems (over 20 years now).

Anyhow, to the OP, Both the Sabertooth and Gigabyte perform the same, their both Tier 1 manufacturers and have solid warranty / RMA systems in place. Honestly go with the one that has the better layout or feature your looking for, other wise their the same.