The fastest mining equipment is in the cloud at
CEX.io. I know it's pricey; but you have no hardware to find, no extra electricity to consume, and don't have to worry about reselling the unit as a paperweight later. I've been mining there since early October, and have kept reinvesting my mined BTC to GH since its easy and has a nice orderbook. PM me if you want some more details.
Worry about selling the unit? That's at least half of the ROI gone there if you use cex. Many ASICs can be resold for more than the cost after mining for a couple of weeks or months!