My suggestion is, do some research first before you jump into "I'm buying a PC today, I'll settle for something!" As it was said... do yoiu want to try your hand at building one? It's fun... (if you want to call it that) you learn a LOT about systems and what makes them tick... and it's cheaper. On top of that you don't get all the bundled crap that comes with a dell, hp, or any other system, even if it is high end. Do some searching around the forums here in the other area of over clocking, tweaking, building systems and read some there... That alone will give you a good place to start.
Plus, think about what you want to do with you machine, either built or bought, if you don't game or any other higher end graphic work... do you really NEED quad SLI??? Probably not... A single, possibly double card, would work for your situation...
Just my 2.5 cents..
Dell 4K S2817Q / Logitech Z-680 / Func MS3 Mouse / Corsair K70
NZXT Source 530 / i7-3770K / Corsair H100 / ASRock Z77 Extreme4 / SoundBlaster Recon3d
Samsung 850 PRO 512GB SSD/Seagate 1TB/2TB/WD 2TB
4x4GB Corsair Vengeance 2133 / PNY GTX 980 ti/ Seasonic M12II 850W