Rollo as u said i would like to see something like the MAXX again.
In my opinion i think DUAL GPU not as in cores, as they are already multicores. Will be the way forward, the costs will be the same, maybe the board might be bigger, but also the power consumption will be less than having 2 boards, and u wouldnt need to have an additional PCI-E slot either.
Again as ive said in many other posts, i believe ATi will come out with something like that, but nV are only bringing out the SLI as a stop gap measure, and they also have something similar up their sleeves also.