I'd think that you'd want around 10 Ths (10 000 Ghs) to make it worthwhile. also you'd probably want to add a THs every month or so.
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I wouldn't even bother solo with this hashrate only 20+ if not more.
What kind of hardware do you suggest?
I suggest you to get lots of SP30 miner. It has the best $/GH and the lowest W/GH. Check my sig (affiliate link + donations if you buy through it).
SP30 will be 2400 Watts for 6 TH/s!!!!
That's simply not true.
One month and a half and it will be true!
Why would they not offer in stock sp30s as soon as they get them?
Because having a a couple hundred/thousand units in stock needs a lot of components ordered first and a lot of preparing.