Personally, for that amount of ca$h, I'd take motherboard wit SAS controller (maybe not like AsRock Z87 Extreme 11/ac, because it's simply too big and too much SAS ports) and connect 2-4 SAS drives in RAID which are quicker and have own bus unlike (S)ATA drives. UEFI is a norm.
WiFi is such unhealthy cr*p that people should be warned like buying cigarettes: pack of cigarettes won't kill you directly after smoking, but after many years - might do. Exactly the same you've got with waves penetrating your body which changes cell structure. Take some powerline adaptors which are better (ping & transfer) and healthy.
32 GB of RAM is not overkill: use 8 GBs and rest use as a RamDisk to store your swap file and TEMPs directories (unload SSD and make it lifespan longer).
3D in terms of graphic cards means you must have compatible monitor/TV, so make sure those ones you already have are compatible.
2-way SLI is much more better in terms of "efficiency/price" than 3-way SLI, so try to get two cards and not 3, unless you want to beat some benchmarks.
1200W PSU depends on - mostly - graphic card you take. In case of two 770s/780s 1000W would be enough. Get some modular with Platinum certificate - modular means braiding customizing for casing/motherboard colours.[/]
Do not mind about WiFi, i smoke and have smoked for a long time, i'll die from cigarettes before WiFi abuse.
3D I have a compatible TV large enough for 'funs'.
1000w Modular should be suffice? That's good then tbh. Might upgrade to a 1200w Modular, remove Watercooling and get a nice CPU fan instead for now. Now nervous of watercooling perse, I am nervous of my PC being in the front room, And that's the 2 / 4 year olds hangout spots!
Also off topic, i also need a PC desk, But i have a few requests here.
PC Desk Must be able to house a 32 or 42 inch monitor. Have space underneath for PC, And have room for 10 consoles. This sounds like a large feat, But my TV stand i use at the minute does a good job of this, just need something taller so i don't have to use a lot of beanbags!