If you are building and haven't purchased your RAM for a new build, then you might as well go to 1600. If this is for an existing rig that you already have RAM for then no, 1600 is not enough of an improvement to be worth your while. Your motherboard does support overclocked RAM - if you're willing to deal with a little instability and some trial and error, you could go with higher speed DIMMS. The price is directly linked to the speed so you might want to look at what is available and see what you're willing to spend and if you want to go through all the headaches of overclocked memory. 2133 and 2400 seem to be a viable option, but you'll have to make some tweaks to your BIOS and I am not sure if that is something you'll want to do.
I am lazy so I have left mine stock - I am using 16GB of DDR3-1333 in my rig and it is making Battlefield 4 it's biotch so I don't think skipping up to 1600 is worth it, especially if you already have memory in your system.