That CPU is only guaranteed to work at DDR3-1333 speeds, but there's at least a 95% chance that it will work just fine at DDR3-1600 speeds. Of the 5% of the cases where it doesn't work with just an XMP profile, 80% of the cases can be solved by loosening timings and/or bumping the voltage. The remaining 1% are just lemons and there's nothing that can be done about it.
nThe 2700k processors are top binned, the chances of it not running 1600 out of the box are next to none. If I were you I'd go ahead and get the Vengeance RAM because it's awesome and worth every penny.