I can't recall if this has been covered before, but I'd personally like to see the TX-130 Saber class fighter tank made.http://www.starwars.com/databank/vehicle/tx130tank/http://www.starwars.com/databank/vehicle/tx130tank/img/eu_bg.jpg
There are three known color schemes to this that would work to your favor Hasbro since there is an opportunity for reissues with different paint jobs. First there is the one with red markings (Republic era), then a more generic all grey one (transitional/Empire era), then the more advanced one with blue markings (Empire era and later video games).
This could fit at the least 3 clones. So that means more figure sales as well. There isn't many "working" parts other than the turret and the "wings" to the side. Even there, you, Hasbro, could cheap out and mold them in the attack position (fixed so that the side "wings" wouldn't swivel).
It's certainly something in the $20 price range which fits your business model for vehciles/ships.
I've been taking some measurements based off the size as posted on starwars.com's databank. The toy in scale with an AOTC clone would be:
16.75 in long
6.25 in wide and
a little over 4 inches tall
(It's quite a flattish ship, though it does hover above the ground)
This is very doable I would think for starfighter scale.
Though when I drew out the dimensions it seems to me to be too skinny width wise.
So something a little more squarish width and length would work. I'm thinking 12in long by 8 in wide, and keeping the 4in height.
That's definitely in size with the starfighters and not much out of scale. Considering the slim height of this, it would be easy to put several on a store shelf and they won't take up much room on the shelf as well as a person's private collection.
Also, it would only fit 3 clones inside, however you could mold pegs on the outside of the tank to allow for 4 more clones to "ride," 2 on each side. Though please put the pegs in somewhat conspicuous areas so they don't detract from the look of the vehicle.
Again, with no less than three paint schemes, this could be a winner for you.
Also, it's been in several games and novels, so it truly has merit:
Star Wars: The Clone Wars game (First appearance)
Star Wars Republic: The Siege of Saleucami novel
Star Wars Episode III: Revenge of the Sith novel
Star Wars: Battlefront game (Hey, if you can make a Rebel Vanguard figure, then why not this vehicle?)
Star Wars: Battlefront II game
Star Wars Battlefront: Renegade Squadron game
It's very much an action oriented vehicle.
And dare I say it, you could adapt it to the G.I.Joe line as well!
So what do you say Hasbro?