honestly...I wouldnt even worry about it. I spent like 300 bucks on a CO2 system and I used for about 6 months in my largest tank and finally said to hell with it. It blew out and killed several fish one night, I never could get it to flow at a constant rate, so I had to adjust every day, sometimes it wouldnt seal properly and I blow through 10 bucks worth of CO2 in a couple days, it was just annoying and I really wasnt seeing a huge difference in plant growth. that tank has minimum surface agitation and about between 4 and 5 wpg of light and the plants grow like crazy I have to trim them back all the time and while it has a little algae it isnt a big problem. Mine was a pressurized system and that isnt, but it just left a bad taste in my mouth for CO2 and seeing the results I wasnt all that impressed. I'd get your stuff set up and running for awhile and then see if you think you need it.
Keep the surface agitation down and the fish will give you some extra CO2. In different tanks I bet I have 20 or 30 or more different types of plants and I have yet to encounter the plant that would die because it didnt have CO2 injection. Certainly not any of the popular plants that are online and at the LFS.
If you are really sure you want to give CO2 a try I'd use the DIY type like caoboy is talking about so if you decide it isnt worth it you arent out a bunch of money or anything. And if you really do like it you can always upgrade to the one you posted or a pressurized system or something later.