I have 3 Core Set, 3 AoU, and 3 of each Corruption Cycle battlepacks, and 1 of each Enemy Cycle battlepack. My friends and I are building as many simultaneous decks as possible from this collection, all balanced against each other to maximise fun, theme, and competition in an almost exclusively multiplayer environment. We build the decks to around 60 cards and try to keep the proxies to an absolute minimum. We are up to nine simultaneous, relatively balanced decks and have plans for a tenth.

I would consider the power level of our decks to be about 70% of "tournament level" decks, but again, we are striving to maximise fun and balance.

***
Our Ork Lightweights deck is one of our newest, and was quickly thrown together one evening from what we had left of the greenskins. It needs some tweaking (suggestions welcome!), but we were pleasantly surprised at how much fun it was to play. Highlights of this deck: the always-fun "ripping the 'thirster" trick; lobbing the sellswords; and the fun of playing a rush-style deck with a little more utility and variety than normal.