The new ZTE Red Bull (odd name!) just announced seems to have very good specs (including LTE support), especially for the price:
The Snapdragon chip in these ought to be faster than the Mediatek equivalent - hopefully it will contain the MSM8928 over the slightly slower MSM8926.
Whether or not this will have support for WCDMA or not, I don't know, but the Chinese manufacturers usually produce WCDMA versions eventually.
The Huawei Honor 3C looks to have pretty good specs as well (including a reasonable camera) but it does seem odd that there aren't many reviews of this one around.
I've never seen a Zopo phone but I'm a bit wary of the manner in which they seem to churn out endless variations of similar hardware with little to differentiate between them. I know that they weren't the most sturdy of phones in the past (video reviews on Gizchina often showed how the whole phone would 'flex' easily). This may have changed for more recent models.
One thing I'd recommend is that you get a phone with support for both 2100MHz and 900Mhz 3G WCDMA frequencies. 2100MHz is the standard in the UK but some of the networks (O2 and Vodafone) have also rolled out 900MHz 3G which can be useful.