NAS:
Case: look into a Norco 4224 unit. They are quite a bit more expensive but will give you more options down the road.
MB: Check
Controller: You have 6 drives so you will only need an extra HBA when you add more drives.
OS: Are you in the right forum?
OS Drive: USB key.
RAM: Check (although you could get away with 16GB until you add more drives)
PSU: Many people recommend Seasonic (I run them as well). Make sure it is 80+ Gold. Wattage seems a little high but should be fine.
CPU: A good choice. I use a G2020 which supports ECC and works well, but if you have the cash to spend then go for the 1220.
Cabinet: Check out a Startech unit. I got my 12U unit for half the price you have listed there.
Switch: I have a SG3216 unit but I am using vlans, LACP, etc. If you need those features make sure the switch you buy supports it. If you don't then go for something cheaper.
Ah. I notice you say that you will have 12 drives. In this case the M1015 is a wonderful choice. Make sure to flash it to IT firmware.
So you haven't provided much information on the rest of your environment. Are you using ESXi or some other type of servers? If not, why would you bother with a full rack setup? This could be a quiet little box in a corner somewhere rather than a space hogging rack. More info equals more feedback.
Edit: I just noticed your planned storage configuration. Please read around the forum before committing to this setup. RAIDZ2 is HIGHLY recommended and with 12 drives a pair of striped RAIDZ2 vdevs would be very nice.
Edit2: BUY A UPS. Don't consider if you need it or not, consider which unit to buy. If you are dropping that much money on this setup please protect it.
Thanks for commenting on my setup! I really appreciate feedback. :D
In regards to the OS, this was just a little typo i'm afraid. Firstly, I wanted to use Nas4Free. But then I read some things about FreeNAS 9 and I was sold immediately.
I tought about the Norco 4224, but 24 drives is a a bit out of my league. Even 12 drives gives me a huge expandability, and i'm not even sure I will ever use all of it, but I just want to make sure I'm safe.
OS Drive; Was this a check? Because I'm going to use one.
PSU: I replaced the one with a
Cooler Master Silent Pro Gold 450W, it's gold certified now! It's also cheap, and i'm very fond of beQuiet.
Cabinet: I'm looking at that now. I could, until now, only find open cabinets from StarTech but i'll check again.
Switch: I will use link aggregation and tinker around with the settings. Besides, 200eu for a smart switch is pretty cheap I guess.
So you might wonder why a rack setup? Just to keep everything tidy in the same place. I just like the looks of it. :D
I did look for UPS', but it's kinda hard choosing the right one that will work with FreeNAS. Most UPS' are way too overpowered/overpriced for me..
Thanks again for your response dude!