Hi, been down this road before, after money and time was spent here is what I recommend:
X9SCM-iiF if you don't need pcie-x16 slots, they come with new bios that support E3-12xxV2.
X9SCA-F if you do need x16, but you may need a cheap Celeron to update the BIOS before booting with E3-12xxV2.
X9SCI-LN4F if you need 4 lan ports and don't want to bother using another nic.
X9SCL+-F if you want the cheapest and you don't need Sata3.
For E3-12xx/V2 setups I recommend using dual rank 1.5v DDR3 ECC Unbuffered ram only, almost every ram issue I had with Supermicro in recent time came from 1.35v ram so I recommend staying away from them for at least a few more years.
The ram you're looking for with this setup are:
Kingston KVR1333D3E9S
Samsung M391B1G73BH0-CH9
There are cheaper options but these 2 are the current gold standard for E3-12xxV2. If you are building more than one server, you can get the 24G kit (3x8G) Kingston to save a few more bucks.
Btw SuperBiiz have stopped shipping internationally.
Ah you have worried me now, I spoken to Crucial this morning and they guaranteed 100% compatibility with this RAM :
CT102472BD160B - 8GB, 240-pin DIMM , DDR3 PC3-12800 from Crucial.com However it's listed as 1.35v but can run at 1.5v, I hope it works as I've just ordered 4 sticks of 8GB.
Finding 8GB ECC Unregistered sticks is to near impossible in the UK, Kingston have lead times of 3 weeks minimum, none of my suppliers can get any brand.
Also regarding the OP question and the great advice you have given above, may I chime in and suggest that the boards with the prefix A, i.e. X9SCA have a 16x PCIe slot, but all the remaining PCIe slots are only 4x electrical but 8x mechanical, so not ideal for multiple RAID/HBA's.
I had a pick of all the boards, but I went with the X9SCL-F as I will not require onboard SATA 6 as it's only being used for an optical drive and will run 1x HBA and 1x RAID card. The mATX versions of these boards are a bit better than the ATX versions due to more 8x PCIe ports. Not sure why they didn't do that with the ATX boards.
The NIC issue didn't bother me either as I will be installing either a fibre card or an Intel I-350, so overall for my needs it's ideal. Plus you can disable the PHY NIC via a jumper on the board, though patching ESXi/Linux isn't difficult if you want to use it.