Would appreciate advice on first Build

You honestly don't need a 850w psu for the 770gtx. Their was a recent video doen by overclock3d that showed that a 450 watt psu from the RM corsair series was able to power a 780Ti which requires probably more power then the GTX770.
http://www.youtube.com/watch?v=ajiN9aVOv4A&list=UU_SN80_V2GymyCWM2oTYTeg&feature=c4-overview

Also, you only have listed one hard drive. In order to do something like a raid configuration you would want to do more then one. And given that you are doing video editing and things of that nature I would think that having a SSD scratch drive would be amazing and perhaps a OS drive as well. So perhaps one way you could go about it is to have your storage drive where everythign is moved onto after it is written onto the SSD and then have your OS's on the SSD as well so something like maybe a 256 or 250 gb SSD would probably be up your alley whether something like a Samsung 840 Pro or EVO but one of those would be great for abuild like yours.

In terms of the memory you have selected I have nothing against your choice of the corsair lp memory kit for 16 gb however one thing to keep in mind though is that with your h100i the need really for lower profile memory isn't quite their if you are using a water cooling solution. Something like Crucial Ballistix Sport would save you some money just about 30 dollars in the end on the memory.
Corsair Memory $169.99
http://pcpartpicker.com/part/crucial-memory-bls2kit8g3d1609ds1s00
Crucial Memory $139.99
http://pcpartpicker.com/part/crucial-memory-bls2kit8g3d1609ds1s00

The only thing really that benefits you with a board like the Maximus boards is that you have a higher threshold for overclocking potiential given the components on the boards. However, at this point with the Haswell CPU's a lot of the overclocking is handled via the CPU itself so really spending a ton of your Motherboard unless you are going for the tip top of the overclocking spectrum is wasted.

Something like this is what I would recommend for your motherboard choice. Solid board maker, solid board, cheap price.
Asus Motherboard Z87 105 dollars.
http://pcpartpicker.com/part/asus-motherboard-z87k

So in the end perhaps something like this. This does not include some things. Case, OS, Monitor/s, mouse, keyboard.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor ($329.98 @ OutletPC)
CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler ($97.16 @ Amazon)
Motherboard: Asus Z87-K ATX LGA1150 Motherboard ($105.79 @ Newegg)
Memory: Crucial Ballistix Sport 16GB (2 x 8GB) DDR3-1600 Memory ($139.61 @ Amazon)
Storage: Samsung 840 EVO 250GB 2.5" Solid State Disk ($149.99 @ Amazon)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($87.96 @ Amazon)
Video Card: Asus GeForce GTX 770 2GB Video Card ($328.98 @ SuperBiiz)
Power Supply: SeaSonic S12II 620W 80+ Bronze Certified ATX Power Supply ($75.98 @ SuperBiiz)
Total: $1315.45
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-04 03:12 EST-0500)

Hey
Sli/Crossfire means that you can run 2 Gpu's together in tandem. I would not recommend this as it is not supported by all programs.
I would recommend a Mini ITX Computer. Overclocking would not be necessary as it could damage lifespan of components if done wrong.
I would recommend this build: http://pcpartpicker.com/p/33RHe

http://pcpartpicker.com/p/34oXU Use this build