Get the Oneplus One phone for $350. It is incredible. This company was started by a former Oppo exec.
http://oneplus.net/one
While your dc10audio Briton II's are on my speaker bucket list.

I have to admit that while Oppo OnePlus has incredible features, for me it still comes down to the size of these smart phones. Everyone has different needs, but for me I need a phone for calling people and for checking my emails both business and personal.
Hell, I still have an Apple 4s even though I have an upgrade available with Verizon. If I upgraded it would be to the 6 which is just a bit taller (height) than the 4s. Unfortunately, I wear a suit 5 days a week and my phone needs to be used and NOT seen. The 4s fits in my shirt or suit pocket just fine with a height of 4.5 inches with the 6 coming in with a height of 4.7 inches. The 6plus/Samsung Galaxy coming in at 5.5/5.6 inches respectively.
While the Oppo OnePlus features look great, the height is even more at 6 inches (152.9 mm)!
Regards,
Randy