maybe around 1.4/1.5
Predominant use will be high end gaming
Need OS and best gaming monitor 144hz
no overclocking will be done
don't need keyboard
Should be silent
okay heres what i came up with...
i didn't pick an unlocked processor because you said you were not going to overclock. hope it helps
Good build. Although I just don't see the point in a $650 video card, with a locked i5. (Not saying it is your fault, I am just questioning the OP's reasoning.)
I also would like the best 27 inch 144 hz monitor (doesn't need to be in the budget)
Currently that is the best I could find with a 144hz refresh rate.
If you lowered it down to 120hz, than you would open yourself up to a more diverse market.
Please make a spec which you would find on equal level
with a 27 inch monitor and OS
Probably much more balanced for the budget you are looking at. Honestly a 780 wouldn't be needed for 1080p gaming. And I found a 144hz monitor for you with 1ms response time, but it is a 24 inch. If you can live with the fact that you are losing 3 inches on your monitor (which is half the price of a 120hz 27") and the fact that your GFX card is the next best thing (which is also $250 cheaper) then I think you have a good build on your hands.
PCPartPicker part list / Price breakdown by merchant / Benchmarks
Rememer guy, he is likely to want to achieve 100+ fps MINIMUM in order to justify purhcasing monitor with high refresh rate. OP was on the right track to start with and downgrading the GPU in this situation is not ideal for someone who is unlikely to run system beyond spec.
The monitor does not need be included in price, either ;)
Damn. I forgot about that the monitor wasn't included in the price. Probably two 770's would suit his needs in that case.
I was going to submit a part list...but the problem is you want a silent system.
A silent PC with your intended use and budget just isn't practical. You could, however, easily build a quiet system.
The EVGA GTX 780 3GB Superclocked comes with the same superior (and quiet) blower as the GTX Titan and I believe a great choice.
You said you want a 27" 144Hz monitor and their is really only one choice: Asus.
Now if you need help choosing the rest of the components I'd be glad to help but first I must ask if you will ever possibly install another expansion card other than a GPU?
I only ask because that will determine whether or not you should go with a mITX or mATX motherboard.