For your review! My first unRaid server

CPU: Intel Core i3-550 Clarkdale 3.2GHz LGA 1156 73W Dual-Core Desktop Processor BX80616I3550

Motherboard: SUPERMICRO MBD-X8SIL-F-O

RAM: 8GB generic

Case: NORCO RPC-4224

Power Supply: CORSAIR Enthusiast Series CMPSU-650TX 650W

SATA Expansion Card(s): Super Micro AOC-SAS-LP-MV8

Cables: NORCO C-SFF8087-4S Discrete to SFF-8087(motherboard sata to backplane) 

          NORCO C-SFF8087-D SFF-8087 to SFF-8087 (SATA card to backplane)

Fans: not sure but will be doing the 120mm

HDD: mixed bag for now = 15drives

Server function: It hosts all my data files - Videos, Music, Pictures and Backups. Maybe Rtorrent,Sabnzbd and airvideo.

I want to pull the trigger just not sure if i am missing anything. Also not sure if I selected the correct cables. Alot of the most popular motherboard for unraid posted in the last year are unavailable/discontinued. I am not sure if i selected the best mobo for me at this point; with new 2011 mobo about to hit the street.

motherboard is very picky on ram

I'm using Kingston ValueRam Dual Channel 4 GB, PC3-10666, 1333 MHz, 9, ECC, Kit Of 2  (KVR1333D3E9SK2/4G) link

make sure to check the website for ram compatibility

Yeah, I second checking the QVL for every mobo you're looking at. If the motherboard manufacturer has tested a particular stick of RAM, it will be in that list. There's really no reason not to buy from that list, because you'll always find something reasonably priced or some wildly overclockable model.

You end up with a dozen or so tabs open to different RAM product pages, but you find a model that is tested and supported.

I agree that you need to double check the RAM.  This is the RAM that I use with that board.

The cables you have chosen are correct.  For 22 drive support you need two of the reverse breakout cables (NORCO C-SFF8087-4S) and four of the miniSAS cables (NORCO C-SFF8087-D).  You also need two of the SASLP cards.

Here's some good quality fans.

I personally dont care for the CPU and memory layout of that board.  Seems pushed so far back toward the drive's that it will make things difficult to manage as well as eliminate the potential for simple passive cooling.  It is also overly expensive for your needs if your not going to use ECC memory.

Slipstreams?  Junk!  Do you really want to trust your data and drives to a sleeve bearing with 30,000 hr mtbf?  Go with a noctua, noiseblocker, s-flex or something with a quality bearing so you can sleep at night!

I went OCD on fans for like a month when I built my last box and I bought one of every fan out there.  Personally, noiseblockers are it for me... but they are spendy.  Noctua are nice too, great bearings but I like to slow them down a bit.  I have noctua nf-p12's in my unraid running 50% and they are extremely quiet and push plenty of air.