Probably not a popular opinion but I have owner a depth and dual Abyss subwoofers. The Depth is one of the best musical subwoofers I have ever heard. I have also owned a couple of SVS subwoofers and they are one of the top of the food chain sub companies for HT. 50/50 mix I would definitely lean towards the dual SVS subs. The Depth really doesn't get much respect around these parts, especially at it's MSRP price range.
Oppo BDP103, Sony 70" LED, Definitive Technology Mythos STS Towers, Definitive Technology Mythos 9's x3, Pioneer SC-1523-K, Furman Elite 15, Harmony Ultimate Hub and Rythmik FV15HP.