That does not sound like a use case for an E5 CPU at all...
Typically you would use those if either of these apply...
-you want to many processes (using their many cores and or dual cpus)
-you want lots of add on cards (using the extra pcie lanes)
-you want lots of memory (using the extended memory options with registered ram)
Your use case screams for a E3 box, typically 4 cores, 8 threads, depending on age 32 or 64gb ram max, 16 pcie lanes - way less power on idle.
O/c the 2667 will do all that too, but at higher idle power (but much more reserves and the option to use more resources at any time o/c).
100 pounds (GBP I assume) is not a bad price, but these only will get cheaper, and the CPU is only a part of the system. Look at the whole box price.