We are always in uncharted waters, I remember back in 2011 when the price all of a sudden jumped to 30 dollars, everyone was like BUBBLE, and it turned out be true, but lately with China...it's no longer a bubble.
Anyway, I purchased 3.3Gh/s at Cex.io which are mining as we speak, but then the question arose what happens when and if the site shuts down and I have like say even more Gh/s.
you wont ROI on that, you wont ROI on any hardware right now that I know of, I am interested in hardware too, if you find something dirt cheap and fast let me know