I'd prefer GX. Seeing how x8/x8 is only saturated by a few cards (and even w/ those cards there is only a 5% performance drop) and you get int. graphics to fall back on (Int. graphics that can handle CS:S exceptionally well) I used to always go for the top notch motherboard, but i'd always have a lower end CPU and higher end single GPU so I never end up using the other video card slot (Well I did have dual 5770's for one day, but that doesn't count

)
When you look at it, the only real perks it has is x16/x16 and power/reset buttons(Something I like, but I am not interested in giving up int. graphics and paying $70+ more for)