If you want to start up with mining then I think you should go with Promax7 Asic based G7 miner which was under R & D and is newly launched into the market giving the highest Mh/s till date then any other Asic available in the market .I think this one would be better to stat up with as the prices of the other two GPU miners of Promax 7 are bit on a expensive side .
promax G7