Though I haven't tried the above-mentioned phones, but, Lenovo, Xiaomi (I wish the mi TV2 were available here) and Meizu have become very popular in the region! Lenovo in particular, with its acquisition of Motorola, is looking to break into us and european (already present in some countries) markets by 2015! Oppo was already popular for its blu-ray players but with its innovative (rapid battery charging, premium materials, swivel cam, etc...) flagship phones it's also gaining marketshare! Ultimately, it comes down to the chipset and your preference for the flavour of Android OS (Color, Flyme, Aliyun, ...) for a given budget!
http://www.gizmochina.com/ is a good site to keep up with the flurry of releases!