I'd love to see 20$ versions of starfighters like the X-Wing and TIE Fighter, while perhaps not scale accurate, I think you'd be able to effectively get the look down. They would also be affordably massable, which is something you just can't do with current TIE sets. Which, I might add, I'm pretty sure is a crime.
I could see the X-Wing, the TIE Fighter, the Naboo Starfighter, and the TIE Advanced given this treatment, as well as ships that have already seen the $20 pricepoint recently, like the A-Wing or Vulture Droid.
(Speaking of Vulture Droids, a highly articulated transformable version would be the bees knees. Easily my favorite starfighter design in the franchise.)