overkill and impractical. generally a waste of money unless you absolutely have need of such parts for other tasks.
the strange part is all that hardware to drives only a single 1080p monitor.
also it should be noted that the a single gtx980 performs at the same level or better than the 690 even though its a single card while the 690 is a dual card. this means its possible to potentially quad-sli 980's while you could only use two 690's ever. plus, the new gtx980 is very efficient in terms of heat produced and energy drawn.
this sounds more like a "build the best computer for any money" than a practical build to me at least.