for the latest AM3+ motherboard and everything is using Tehnology UEFI BIOS, so not hard difficult Oc through the old bios, I've got TA890GXE still want to upgrade to a 990x anyway, but still waiting for the release of a bulldozer that review the ability of AM3 mobo will look 990x mainly price and performance.
patient should first AM3+ mobo capabilities will be different if it had been taking Bulldozer. just suggestion
There isn't a real advantage going to an AM3+ mobo unless you plan to upgrade to an AM3+ CPU in the future. My preference based on personal experience would be Gigabyte, then MSI but either should serve you well. Both have overclocking features in the BIOS.