If you're doing a high tech tank I.e. high lights and good ferts, it is definitely worth it to go pressurized. I got the UP aqua dual gauge regulator on amazon for (75$), the paintball adapter (17$), and a 24 oz paintball tank. I have the solenoid on a timer which comes on two hours before lights and goes off one hour before they do. I highly doubt you will regret it. DIY co2 would definitely suffice on a tank like this though.
You can also get a t valve and use a single setup for two tanks.