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The best starting place is definitly a couple Battalions. With the contents, you can build 12 Ogre Bulls(with Ironfists, XHWs are lame) 12 Ironguts, and 6 leadbeltchers. This will basically set you up for Core even up to 3k.
To the 2 battalions you will want to add 2 Ironblasters, 2 boxes of Mournfangs, Firebelly, and a Slaughtermaster. The 2 unassembled Leadbeltchers can be made into a Battle Standard Bearer and a Butcher using the extra bits.
This will easily get you into the 3k range.
Mournfangs and Ogre Bulls should always be assembled with Ironfists.