So is it the kind that you slide into the cage? The only issue with that is it will not contain all the water run off and over spray. If you are going to continue hand misting it may work for you but you will still get leakage onto your table. If you are going to use a mistking auto mister then you definitely want to consider upgrading. I think it just depends on your needs.
What I would encourage you to do is do as much research as possible and learn. Because your going to find that your enclosure needs more and more. This does add up. I can tell you what I think but my way is not the only way. I have spent about $2500 total on Beman for his entire set up. This includes the first $400 that the store told me I needed to buy that was all wrong. My enclosure is fully automated dimming thermostat, lights, mistking, dripper, and fogger for nights. So I can leave town for 3 days if needed.
So basically figure out what you want him to have and what suits your lifestyle (if you need it to be automated) and go from there.