Well, I'll offer my $.02 which is likely more confirmation. I'm also not so sure having the aquarium in the youngsters room is a very good idea. It wouldn't be long and he'd be taking little toys and playing in that water or imitating mommy/daddy and FEEDING the fishies. You'd be better served having it in the living room.
As far as aquarium kits, I agree with Byron. Even 'ensembles' with just tank, stand and hoods come with the caveat that the lights provided will typically not support living plants (other than floating). I know this from my Marineland 60g ensemble.
Now when it comes to plants, it may seem too much 'bother' to begin with...and that's fine. But living plants not only add an additional dimension to the aquascape, but also do an amazing job in assisting in water purification. There value just can't be understated. If you want to hold off on rooted plants in favor of plastic, okay...but add some floating plants as they'll be well worth the modest investment.
Make sure you get an API freshwater master test kit. I didn't at first and am sorry I didn't (just found out I have very high nitrates in my tap (country well) water. The test kit will allow you to monitor your cycle process.
Filter: Stay away from HOB cartridge filters. Eventually the cartridge will need to be replaced and the beneficial bacteria in the cartridge gets thrown away. For a HOB, I'd go with and AquaClear or a Fluval 'C' series. I would not go with a canister on any tank less than 55g. (I run two AC70's on my 60g.)
Heater: Lots of good ones. I happen to have two Aqueon Pro submersible heaters. They are plastic coated aluminum (not glass) and have a green light/red light indication operation. I'm very happy with them. Why two? Well it's somewhat system redundancy (I have filters and heaters on a UPS as well). First is load solitting with both set around the same temperature, one heater shares the load with the other. If one fails, the other is there as a back-up. If one sticks on, two doesn't help, but without a high temperature alarm, nit much to be done about that.
Lighting: Even though your not thinking plants to begin, you might better have lighting that would support them later so do some homework on lighting.
Hope some of this helps.
Good luck and welcome to the forum.