I am building a 10 bay NAS just like your need
1. Xeon E3-1220L -V3
2. 8GB DDR3 UDIMM ECC RAM ,(RDIMM not supported)
3. MATX C224 motherboard (2 sata 3.0 on board,4 sata 2.0 by mini-sas, 8 SAS by mini-sas in LSI2008 on mainboard) ,this is a mainboard from GreatWall R320 Server ,you can buy it from taobao
4. Display Card : VGA on MainBoard
5. Mid tower case- SilverStone KL04 or TJ04-E ,if you choose KL04 ,bur two1-4 SATA power convter cable
6. Network on MainBoard: one 10GB-sfp+ intel 82559 ,2x 1000M eth(intel i210 ,not supported by dsm 6.02 jun mod 1.01) ,1 ipmi eth port
7. PSU : SeaSonic G-550W
8. HDD capacity : 8x3.5 , 6x2.5 in case ,and the case has 4x5.25 cdrom bay for expand 。
there is an PCI-E 2.0 X8 slot on MainBoard for expand,I use it as pci-e eth expand。
I buy all these in china cost about 350 US$, everything is secondhand except PSU
hope it is useful for you
