I use Hovabators. If you won't be moving the unit at all, and it's on a stable surface, you don't need a substrate. Otherwise, use some vermiculite or perlite to prevent water splashing.
A square of fluorescent light grid can be set down onto the ledge inside, above the water/substrate mix, and that's what you put the eggs on. (This ledge holds the wire mesh insert they include, but you don't need to use that--if you do, put it under the light grid). The plastic water reservoir will keep it from leaking.
A Herpstat 1 will work just fine to control the incubator. Don't bother putting on the included wafer thermostat at all, just tape over any holes in the top left for it, and you're good to go.
I like these, they hold temperatures VERY well, even when room temps fluctuate a lot. Plus, you can just add more of them as your collection grows. I can fit 5 clutches in one. (Mark the eggs so you know who's who).
I'm also a fan of the 'don't put all your eggs in one basket' philosophy--I can add more hovabators. If something ever goes wrong with a thermostat, or one of the units, I don't lose everything. With a single cabinet incubator...that's too much risk.
If the Hovabator wears out (they are styrofoam), I can just get a new one, and still use the same thermostat.