Have written a guide for the game, to help out others here. Has Upgrade tree, Unit stats and upgrade costs, types of enemies each level and a couple of tips.
Please up-vote to keep this near the top.
Download here
http://img823.imageshack.us/img823/2273/epicwar4guide.pdf
Great game, the Epic War series keeps getting better.
Have spent a little time noting the upgrade tree and stats etc which you may find useful.
http://img688.imageshack.us/img688/8121/epicwar4units1.jpg
http://img14.imageshack.us/img14/7766/epicwar4units2.gif
http://img210.imageshack.us/img210/8922/epicwar4units3.gif
http://img16.imageshack.us/img16/2328/epicwar4units4.gif
 "Epic War 4"){kind=icon}