I stupidly asked for a telescope on a whim for last Christmas and DP went off to a telescope shop(!) to seek advice and bought me this one, which is apparently a good example of a good beginner telescope.
You don't say how old your DS is, but one thing to note is that it is massive. I thought a telescope was something the size of a couple of pringles tubes, but this is more like the size of a medium sized dog - it comes in an enormous box, so do you have somewhere to store it?
The weights on the tripod are very heavy and I could not move it by myself.
I spent a lot of time out in the cold looking at the moon and I once managed to train it on jupiter and saw a fleeting glimpse of it's moons before they moved on.
After that I gave up and it sat in the corner of our living room until I sold it on ebay (there are lots of the same telescope second hand, hardly used - have a look you might be able to pick one up that is like new).
But this is probably a reflection of the number of people like me who have bought telescopes without not really knowing what they were doing.
Not wanting to sound negative, and maybe your DS is a lot more enthusiastic than I am, but something to consider 
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I think the binoculours route might be a good one for me, and I intend to use the money I got for my telescope to get some.