If you're considering a 5 GH/s Jalapeno, I'd recommend buying 4 Antminer U1 sticks instead. Even with 4 of them, it's cheaper, and they easily overclock to 2GH each, plus they only draw about 2 watts each. So for less money, you'd get 8 GH/s for about 8 watts or so (not sure how much wattage is added with the overclock).