When you say you need a board that will take two 6970s, you mentioned in an earlier post that you have two ASUS HD 6970 Direct CU II cards on order (triple slot coolers). Is this still the case or are you looking to change that now?
Also, to point out to others, the sound card the OP mentions is a PCIE ASUS Xonar DX.
If you want to stick with the triple slot GPUs, then the 8 slot MSI Big Bang Mashall is a good deal (especially if you get an expensive CPU cooler free with it). However, you may have an issue with fitting a massive board like that in your current case - I will go have a look at that now.
If it does transpire that your existing case can't fit a "34.5cm(L) x 26.4cm(W) XL-ATX Form Factor" board like the Marshall then your options are to either:
- change the graphics cards for dual-slot cooler models
- do without a PCI/PCIE sound card (USB card perhaps)
- change your case for one that fits an 8 slot board like the marshall