Given the price of the plastic conicals from minibrew, I'd probably rather buy a brewhemoth. Less than $500 shipped, and most of the reviews all seem to be positive. Relatively inexpensive temp control as well, provided you can generate the hot/cold liquid for pumping through the immersion coil.
The reason I'm still fermenting in buckets for now is just volume- I tend to have a batch in primary and secondary at all times (well, at least in +1 week, I don't always rack to an actual secondary fermenter), and buying two or three conicals seems like quite an investment compared to just owning six buckets. Plus, my buckets all fit in my chest freezer. Still, someday *dreamy eyes*.