Sticking with completely-ignoring-the-biref-from-the-OP and so a car that’s been out of production for ten years, the Alfa Romeo 156. Specifically an early one.
Aesthetically pleasing, but a design cul-de-sac since they used more of the 147 look for later cars (including the facelift of the 156).
Dropping in value in the second hand market to such low levels that idiots now own them, with the attendant ruination of most of them through what little is spent on them being on dodgy rear light replacements rather than regular maintenance, plus they’re Alfa Romeos so most of them will die regardless.
My specific tip is to buy an early V6, in red (not metallic, plain “rosso”) with black leather interior – if it’s an early one the front seats should have the full colour embroidered Alfa badges. Veloce wheels (the 16″ alloys with the 5 circles). No bodykits (including, imho, the factory skirts, the car looks better without)
Already getting rare – there are only 3 V6s on Autotrader at the moment, and none of them are red.
The GTA is the more obvious choice and probably objectively a better one, but to my eye the bodykit and over-large wheels spoil the looks, and it’s the looks that make the thing a bit special in the first place – GTA or not the floorpan started life as a Fiat Tipo.