Spiderman, Spiderman!

 My son is OBSESSED with superheros. Batman, Ironman, Green Lantern, Superman, etc. But his first love is Spiderman. The obsession began before he even turned 2. Way earlier than I expected. And while many obsessions for children come and go, my son is now over 3 still going strong. He has several superhero shirts and basically wants to wear one every day. He is currently asleep upstairs in his batman PJs, complete with cape.

I have been eying the spiderman bedding at Pottery Barn Kids for some time now. My son's room is already light blue and dark blue, so I wouldn't have to do anything else at all.

It's now 20% off online and I soooo want to order it. I won't buy it all...just too much.
But I was thinking I could just get the duvet and a sham and match it with solid sheets. (And of course my son already has spiderman sheets from Target!) If I get the duvet, do you think filling it with a regular twin bedspread would be OK? I don't want to have to buy a down insert.

Now I just need the hubster to approve...