Not saying to skimp... just that depending on your use case, if you want a slightly higher clock, the 2690 would still give you 10 cores while also giving a bit better single thread performance at a cheaper price to boot! The system I'm putting together has 2 CPUs so I don't obviously I probably would not miss the extra 2 cores as much as you might...but for the price difference IMO could be better spent on more memory, good GPU, PSU, more storage, etc.
Unfortunately the E5-2697 V2 being at the top of the Ivy Bridge Xeons their price is not likely to drop much until they're completely and utterly obsolete...similar to how the X5450 was and the X5690 is now...