Although I must point out USB miners are more of a hobbyist thing then a serious mining rig, I went for the DrillBit USB thumbs (3 of them) which can be purchased here: http://www.drillbitsystem.com They should ROI some time in the next 6 months and may have overclocking capabilities greater then 2.7GH/s.. I am waiting to get my hands on mine to test this theory out!
I didn't mean the word "Hobbyist" to be offensive. But I guess I just don't see Jupiter/MiniRig/400GHs Bitfury buyers mucking about with USB sticks. And by my definition, if a miner isn't hashing with that kind of power, they fall into the hobbyist category.
Btw, I'm a hobbyist currently hashing at 140Gh/s. I'm certainly not making enough to call this a career, lol.
No offence taken sir!
I too am a hobby miner.. I have a single 336MH/s Block Erupter going 24/7..
And I also just purchased 3 2.7GH/s at a hell of a deal from Barntech through DrillBit.
I will be mining at ~8.2GH/s in about 3 weeks hopefully.. A small mine with a slow break even but I'm excited none the less.