With little guys and gals bigger is better. I suggest you look at getting any of the 21st Century Toys 1:32 kits. They are getting harder to find but these are perfect for your puposes. The Bf109 can be assembled in just a short period of time...including gluing the parts together instead of relying on the screws and snap fit pieces. I built this one in under 2 hours as part of a slam build event.
Average price is less than $20.
Sprue Brothers has a limited selection left! I like the Bf109.
My second suggestion would be the Dragon 1:32 P-51 Mustangs...again big and affordable...around $30.00. I've built a couple of them and they're OK...not perfect but fun to build.