The most "bang for the buck" these days are the late '70s/early '80s "G" bodies. Monte Carlo and Malibu Classic both qualify. Good chassis, lighter than their predecessors, and all the "good" parts fit! I like the looks of the Malibu, too (personal opinoin), at least the 2-door.
The best part? The price... They're still very cheap. Make GREAT "sleepers". Small blocks bolt right in.
Jim
Jim