I had that board (technically still have it). There's no "direct" upgrade for it, that supports E3 Xeons. If you are willing to go up to the E5 line there's the X10SRM-F, which can take up to 128GB of ram if you use 32gb RDIMMs though most people find 32 or 64 to be more sane. The 2680v3 is a big jump in cores (12) and a step down in clock speed (2.7/3.3) from the E3 you have. There's also the 2660v3, which is the 10 core version, slightly higher clock speeds, and cheaper.
E5's draw more power (the 2680v3 is 120TDP, the 2660 105, vs 80 for your CPU) but in day to day use I haven't found that to be an issue.
You can find all of this retail or on Ebay. This is my setup:
Supermicro X10SRM-F ($280, new)
E-2680v3 ($290, used)
64gb DDR4 ECC RDimms 16x4 ($115x4/$460, new)
Intel x540 10GBase-T NIC ($140, used, the SFP+ variants are usually cheaper)
$1170 total. Only the CPU and NIC are used, and I'm not worried about Intel failing on me.
You can find the board and ram used to if you want to go cheaper (or maybe it's cheaper that way via Ebay in AUS?). Mine is installed in a Node 804, like so: