I'll go a different direction: Oldsmobile
In its glory days, Oldsmobile was the cooler cousin of Buick, like Pontiac... But with a real job. Although Buick is doing a commendable job walking the entry-level-luxury line, their vehicles are not particularly exciting to drive, and do not appeal directly to younger people. A new Oldsmobile would need to offer a reasonable amount of luxury at a fair price, while still keeping the "fun to drive" ideals in tact. We'd need a four-model strategy:
1) Super 88: Bring over the Chevrolet Caprice Royale V8 from the Middle-East, don't offer any options on the car, and make it $45K, exactly where the Hyundai Genesis is.
2) Cutlass: Use the Alpha chassis from beneath the Cadillac ATS, offer only the 2.5L I4 or the 2.0T with the six-speed automatic. Keep options to a minimum, price it out the door from $28-32K
3) Toronado: Go for more of the '80s vibe, make it a small sports coupe based on the ideals of the 140R Concept by Chevrolet. Swoopy coupe with turbo power. Again, minimize the options, price it out the door for about $25K.
...a wildcard?
4) Starfire, basically a Toronado convertible. A hard-top convertible. One engine and transmission offered, same limits on options, $28K.