JWing---an interesting article from Haaretz on the tactics of the IS indicates with new recruits their strength is being estimated at the 20,000 range which as you indicated they are holding as their reserves in the rear---estimated hardcore fighters at 3,000.
This does not evidently include the Sunni coalition forces from IAI, al Duri, and the tribes.
http://www.haaretz.com/news/middle-east/1.606590
I just published an interview with Small Wars Council's own Outlaw 09 aka Richard Buchanan. He goes through the development of the insurgency in Iraq's Diyala province, the entry of militias, the start of the civil war there and how the U.S. was caught in the middle of these warring factions never really understanding the environment they were working in. Here is a link to the interview.
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