One thing, although we could say that you can keep that rig updated with minor changes here and there, there is no real way to have a future proof machine, we never know what may happen in the next week/month/year that would really require a huge upgrade (to not say a complete new build), with that in mind.
I believe your intent to use this rig is gaming, and therefore I would suggest that you wait a bit until upgrading anything else than your ram, why do I say that ? As aspri mentioned above the usage of multi-threaded applications in gaming was not that huge, not many used 6 cores, but that may change in the near future, including the fact that the new console gens are using multiple cores on them, If none of that worries you, and you have the money to do an upgrade now, I would suggest getting a Vishera AMD (or at least an i5 Sandy or Haswell) with the 9XX series chipset (or Z77/Z87 for Intel) in order to reach a "2 year" proofed rig.
This console gen change may (with really high chances of it happening) induce the producers to create applications to use more cores than before, and depending on what game is in use (BF4, AC4, any other Game that was intender to the Next Gen) may need more than what you actually have in order to run smooth. - Please note that this is my opinion, new gen has just arrived, even if the market is stating that porting from PC to PS4/Xbox1 (or the other way around) will be easier than before, achieving the best graphics available on the platform is still unknown, and therefore lots of things may happen.
PS: You also made a reference to Crossfire the 7850, note that for that you need a PSU that offers 39+ amps on the 12V cable, the Corsair VS550 offers 42 amps, that means that your PSU would be ready for it, but if you start adding too many other devices on it, it may exceed what your PSU has to offer.
PS2: Even with AMD focusing on their APU's, the actual FX family can be of a better value than jumping into the Intel solution.
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