I couldn't agree more with JJ, and his setup sounds very similar to mine, any MANY others that post on this site!
I started with the DIY version and quickly found the amount I was spending on yeast and sugar, not to mention the time (and a little mess here and there!), was costing me much more than a pressurized system would over time. Being the very impatient person that I am, I was a click away from buying a cheap system off ebay. Thankfully I found this site in time and was rescued from making a big mistake. As difficult as it was for me to be patient, the patience is rewarded everyday I get to virtually just enjoy the aquarium and not worry about flowrate fluctuation or end of tank dump. The cost differential between a high quality and low quality system is truly not that much, I calculated I spent maybe an extra $120, which I would absolutely get back if I sold it. You will find some people commenting that their single stage regulators and Big Box store needle valves work just fine, but you won't find any negative comments from people regarding their their Victor (Concoa, etc)two stage reg's with Ideal's(Swagelok's) and Burkert systems. Take your time, connect with people on this site and you will be rewarded by having a better tank setup which will allow you to enjoy your hobby much more.