>>9121685That's a hard one
if just gen springer and magnus, I'd say siege.
But sgt kup doesn't really fit well with that trio. TR kup is the only one that does.
ER starscream is pretty good if you want an earth alt mode.
If you want something cheaper, though, cyberverse deluxe starscream (pic related) might be a good choice for a cybertronian styled jet.
He's smaller though. He'd be dwarfed by Springer