Now is so late for buying this BTC miner,

1. The price for BTC miner is $ 3-4 USD/Gh   http://tinyurl.com/n3e45d6
2. 65 Gh/s no more profitable  http://mining.thegenesisblock.com/a/0442f72033
3. 600 Gh/s also no more profitable http://mining.thegenesisblock.com/a/a2d607361b