My girlfriend actually paid a little more and went to What ale's ya since she read they use beverage grade CO2. She didn't tell me what she paid, but figured it was worth paying more. I'm using my Apex to monitor the ph inside the reactor. I went with a standard regulator and the solenoid is plugged into the apex as well. I hope to avoid the "dump" as well as possible. I'm hoping going with the Vertex RX-C 6D I won't have to worry too much about a "dump" too soon since I read that they are really good at recirculating CO2. If it comes down to it, I can always get the better regulator later.
Thanks for the tips all!