I'm not a builder by any means; I was getting my ass kicked using the other couple builds on the list so I combined aspects from both. The top crystal was giving me grief so I made a little setup up there w/ no further issues. My stats are in the 5-7k range, might work with a bit lower. You can add reflec beams protecting the crystals if any get hit by projectiles.
First build auras, buff beams, top reflec, top wisp, shroom den, one middle wisp (temporary), and gas trap. Second build golems, pylon, app towers, sell middle wisp and replace with stack. Last build main build reflec beams and minions.
On the boss wave on the main build I have: a TB, a couple sums on the wisps with app/hunt/monk guardians. I think the monk guardian is necessary. I also have a long-range DPS out to help it along and for crystal backup. A jester is decent for it since you can wheel heal towers or crystals from afar. You can also HB on your TB monk too just for DPS funsies but that will drain your mana and thus end both boosts sooner.