Hi welcome to IceInSpace
Sounds like you have a very advanced 4 year old.
They are all reasonable, and I know people have tried most of these.
I am sure they will chime in with their reviews.
But to go one step better, Do you think you could stretch to this one.
It is bigger but collapsible so easier to transport.
http://www.ozscopes.com.au/skywatche...telescope.html
It may also be easier to resell if you later want to upgrade, or otherwise.