First off steve, let me say that your ladies look delicious! Very nice job bro! As far as the CO2 goes, were you considering a propane generator? I've been using a Gen1 for a couple years now, and I absolutely love it! My room is about 200sf, and I use a single burner Gen1 hooked up to a 20lb propane tank and a digital timer. The timer is set up to kick on the burner for a half hour, and then off for 1 hour. This keeps the room at a pretty constant 1200-1500 ppm. I go through a tank of propane about every 3-4 weeks at $20.00 per refill. I highly recommend this set up ............ you'll notice the results!
On a side note, I'm considering a couple strains from Dutch Passion myself. I've been a little hesitant to order from them because they seem to be getting some bad reviews on here, but YOU may just have changed my mind. What varieties have you grown from them? I'm considering the Durban Poison from them, and was also looking at "The Ultimate", but I may pick up some of the Euphoria now after seeing your results. Keep us posted ................... I'm very interested to see what you yield, and how the smoke is. Cheers!