HELP! Bad MoBo, best replacement??

I currently have the ASRock Z68 Extreme 4, and I think its great, except the audio on it is messed up. I've been battling it for the last 4 days and I give up. I've tried everything and absolutely nothing worked. I've reinstalled Windows, updated drivers, everything. So it must be the MoBo. If I'm going to replace it, I have a couple options... the ASRock Z68 Extreme 4 is not in stock right now, and will probably take a week to get here. So is it worth waiting to get that exact replacement, or could one of these other Z68 options be as good or even better?

Gigabyte GA-Z68X-UD3R-B3 1155 2PCIEX16 SATA2/3 USB2/3

Gigabyte GA-Z68X-UD4-B3 S1155 Z68/RAID USB3 SATA3

Asus P8Z68-V Socket 1155 Intel Z68 Chipset (I'm leaning towards this one)

or anything on this page: http://umart.com.au/newindex2.phtml?bid=6

I'm really frustrated at this point because the computer is running GREAT, its just this stupid audio error that is pissing me off. So, anyways, honest opinions are welcome. I'd like to take care of this ASAP so I can just exchange it and not have to deal with an RMA or something. Thanks.