Mining Rig Questions/ THoughts?

Etherium/ Nicehash Mining Rig
I plan on using the nicehash miner and to mine ehterium directly. I thought hard about GPU vs Specific x11 or lite coin miners. I decided to go with GPU for more flexibility in coin choices. These have resell value as well and longer lasting warranty. A few questions.
Will I need to get a new monitor for each of the 2 rigs with the 6 gpus?
Should I use ethos or windows with ssds? Can I still mod bios to max MH/S?
Will this be too much wattage for a 120v outlet? If so what can I do to fix it?

(X12) XFX - Hard Swap Edition AMD Radeon RX 470 RS 4 GB $2040
(X 2) DDR4 Board MSI Performance Gaming Intel Z170A Pro Carobon Price $280
(x2) 4GB cheap DDR 4: Price $70
(x2) Intel Celeron G1840 Processor - BX80646G1840 Price $96
(x2) 6-Pack PCIe VER 006 PCI-E 16x to 1x Powered Riser Adapter Price $100
(x2) EVGA SuperNOVA Platinum 1200 WATT Price $460
(x2) Intel Intel Celeron G3900 Skylake Dual-Core 2.8 GHz LGA 1151$100

Power cost: 10 cents an hour, Wattage 1,500 from this? Without undervolting.

Total Cost: For 2 rigs= Around $3300 or so add tax and tools for case setup. So $1650 a rig not bad?