Re: General Motors
GM has had recent technological partnerships with Subaru and Suzuki. I figure if they buy another company it will be one of those two.
The alternative will be snapping up a Chinese brand, but I think the leading ones are state-owned and I don't see Beijing letting go too easily.
Proton in Malaysia is small enough to buy comfortably, but I'd be surprised if they go for such an insignificant player.