Hey, looks as if you are on the same path as I. After having already gone through this delema myself, trust me when I say...don't skimp now, it will only cost alot more later not to mention all the time involved in changing stuff mid-way that is not soo efficient. Save your $$$ and buy some essentials. CFL's are cool but by the time you buy enough of them the cost really adds up. I am a rescourceful broke ass joke but I learned quick that if your gonna burn rescources you should put them to efficient use and at least set-up to grow plenty to last the next few months til the next run is done unless you do a perpetual. This is what I went with and it works AWESOME. I built a cabinet 6ft tall, 2ft deep and 4ft wide from 5/8 particle board and painted titanium white. Doors are gasketed to seal up. First essential I bought was a lumatek 400w ballast pretty cheap from a N cali wholesaler AWESOME PIECE!! a cool tube and a centrif in-line fan as well as a goblin carbon filter hooked in tandem and vented outside the cab. I bought a tub made by cornerstone(lid has lock tabs all around it) 20gal(added a fawcet tap at bottom end to flush) and 2 quantum trays for rockwool slabs but I use clay pebs instead. Also air pump, stone, sm h2o pump, sm circ fan, tank heater....etc unless going soil, either way but I prefer hydro. Now on to the heater as I also deal with the same cold north climate. I use a old style hydrofarm climate controller for fans so on the intermit outlet that shuts off when temp/humid rise I built a shielded light bulb fixture for a green party light bulb and use the controller outlet to turn on/off bulb as heat rises/falls in dark cycle....the cats ass!!! I'll try to post some pics if your interested. Hope this helps. BTW the first run out of this cab is almost ready to harvest of the mendo purps. It works soo well that even after many detremental mistakes with nutes def, then toxic, ph spikes and every thing that could go wrong, the climate stayed perfect and they have recovered nicely and have made some very dank dark purple frosty rock solid buds. The next must buy for me is an ec meter, not knowing where things are SUCKS ASS!!