Lync 2013 design with minimum resources

Let me give one example and ask.
For 1000 users , Lync 2013, only IM/presence, Audio/Video etc., High availability needed, DR needed.
Plan to have 2 FE servers in DC and 1  FE in DR, all 3 FE are part of one pool. How is  this idea? Will FE server in DR require license as it is in passive mode?
                       OR
2 FE servers  in DC and 1 FE in DR , both are in different pool, I understand MS does not recommend to have 2 FE , it should be at least 3  but there are cases where it can be done. Hows this idea?
Which option is better and cost effective?
1 SQL , 1 SQL witness  in DC and 1 SQL in DR , these are mirrored ,  is there any drawback of this?
2 Edge in  DC , 1 Edge in DR in different pool    OR     1 Edge in DC and 1 Edge in DR in same pool. Which one is better and possible way?

1) Stretching a pool across geographic areas isn't supported anymore.  You'd need 20ms latency and a 1 Gbps connection in the Lync 2010 days. 
http://technet.microsoft.com/en-us/library/gg679096(v=ocs.14).aspx 
Yes the DR server would require a license, there is no passive in the pool.
The second option with separate pools (configured as paired pools) is the best option.
1) The drawback is that if your DC is down, your SQL won't automatically fail over because your primary and witness are both down.  You need to make sure you'd have a sufficient pipe for this mirroring.
2) The edges in the same pool but geo-dispersed would be OK, but without intelligent DNS LB or HLB you'd get traffic coming in/out of both pipes which might be an inefficient or expensive route.  The separate pools from DC and DR are fine
too, but would require a bit of manual intervention in a failure.  The answer depends on what you need to accomplish and what kind of uptime you're promising.
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SWC Unified Communications

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