cajuntank,
Since your deployment is new, i would just go with Lync server 2013. Also, what's your userbase count?
Lync 2013 has a lot of great features including DR failover functionality.
In my case, we are already running Lync server 2010 and we have over 3000 users. For us, it's best to wait until all the bugs are fixed by early adopters.