that will all be fine! you may wish to spend less on the PSu and more on the GPU though. you won't need anything more than an 850W bronze PSU for your build even if you upgrade to a gtx 690 (would need around 1000w if you went with a titan ofc). i'd say go for a gtx 680 instead and get an OCZ ZX 850w PSU. if you look at my build, i am only running a 700W and your system wont need anything more than until you go xfire. when you do, your 1200w will be more than enough juice for it! don't forget to buy a CPU cooler as the stock ones are shockingly bad and won't allow for much OCing headroom at all.
don't forget that xfire 2 cheaper cards does not always beat a single high powered card, even at a cost.