At this point you have 3 options:

1) antminer s7

2) Avalon A6

3) Buy Bitcoins



Reasons:

1) provides highest hash power per machine. Uses 1300-1400 watts. Loud, and produces lots of heat. Buying these supports bitmain which in turn supports antpool which is bad.

2) lower hash per machine, but uses less power then the s7. uses open source cgminer (from kano/ck) (good). still produces a decent amount of heat, not as loud as an s7. doesn't directly support large spv mines unless you point it there would is bad.

3) best bang for buck unless you have cheap cheap cheap power.