Do some more reading first. If you come here and talk about mining at 400 ghz, you're not too likely to be taken seriously.
Before spending that amount of money be sure to be ready for anything and be sure you're knowing what you're spending it on.
Don't invest what you can't afford to lose.
I've done a ton of reading, i think 400 ghz is an accessible entry point for a noob, if i was talking 1,500 ghz and spending $100k in the next few months then that would certainly warrant some skepticism.
It's definitely a risk, maybe litecoin is the way to go.