Royal would be another one, also Filter Queen and Silver King, though I really can't justify the cost of the latter. If it's an upright you want, Royal, Kirby and Sanitaire are darned hard to beat, too. I think of them, Kirby has the best bags, Sanitaire the fewest things to go wrong and Royal the best durability.
Sanitaires have no attachments to speak of, though (but kits for Eureka uprights do work AFAIK, just not extremely well). Royal attachments are clunky; Kirby attachments are clunky in a different way.
Aerus canisters do have plastic shells, but use a very classic styling and are durable. I haven't used a modern one, though, so I don't know about performance, and the plastic wands feel flimsy to me. I'll level the same objection at TriStar.
With all that said, I'll go back to my top suggestion: Royal. There's nothing like a Royal for carpets, and they're cheaper than a Kirby and at least as sturdy.