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I guess it all depends on what you want to put in it. It looks like the BioCube, so I am guessing it will cost more than a typical 20g acrylic due to it being a complete package.
If it were me, id just get a regular 20g tank and add what I needed as far as lights and filtration go. No need to be stuck buying THEIR stuff, which is usually inferior to other products.
For one thing, you dont need a skimmer, which these things seem to have, in a 20g tank if you do PWC as often as you are supposed to be doing for a small tank.
You will probably be wanting better lights eventually, and that will make it HARD to do with that hood.
If I could redo everything, I would have planned ahead MUCH better than I did.