Hi,
it was really empty here so i just wanted to share my opinion

my choice was the sapphire R9 280x vapor-x 3gb oc it is a good card and with power on 1148 - 1158 volt (with trixx) it does around 732 k/hs wit 250w power (see
https://litecoin.info/Mining_hardware_comparison ) for more info
Regards