Ahh, appeasing the wife changes things slightly. Getting a more subtle case would be good, one of the lian li ideally. Quiet would also be useful if the two are ever to be in the same room, so a cpu cooler + overclock is much improved over the stock cooler. I'm unsure about the 4870x2, what resolution do you play games on? Dropping that to a single 4890, possibly with an aftermarket cooler is worth considering.
Especially as she'll insist on seeing the initial cost, but just wont notice if you add a second 4890 later on. Two 4890s are faster than the 4870x2
Fairly solid spec otherwise. I'd spend more on ram and less on graphics card, and probably a bit more on motherboard. But I'm not a gamer, and it looks like you are. Consider phenom 2, it performs very similarly in games at much lower cost, meaning money spared for cooling & overclocking, more impressive graphics cards, and perhaps an ssd.