I dont know what the BEST one is. but i do know that the suburu WRX Sti Spec C is one amazing car. Ever since i bought it, its been one of my absolute favorite cars. Aceleration and handling is superior to anything else i know of in that cotegory. Maybe a Lancer MR is equal to the suburu.
BMW M3 is over 40K as well.
Oxford Dictionary defines a coupe as a closed two seater car.
Are 4 seaters allowed? If not, it rules out used GTR Skylines.
I suggest a used Nissan 300 Z.
A coupe is a car where the roof slopes down towards the back of the car, usually 2 seats but it can be 4 or more, the Aston Martin DB9 coupe is a coupe yet it's also a 4 seater as are many Porsche's. I think a coupe can have more than 2 doors as well, but the main charecteristic is the roofline. Some cars can be two or more things at once, like a car can be both a coupe and a hatchack like the TVR T350C, it's a 3 door hatchback, but also a coupe.
I couldnt believe that people here wouldnt tell the difference between a coupe and a ...wrx.My vote goes to rx8,and now i am going to buy an alfa gt to see how good is it.I'd like to see the brera though
The best would probably be either a used RX-7 (FD) can be found for around 13k credits, though a newer one will give you better handling. Either of the last generation Camaros would work well, or the Mustang GT. It could be hard to beat a used GTR though.
A Corvette Grand Sport is a good choice handles pretty good, and is (marginally) faster than the Camaro SS, with more top end, so that's what I would pick. It's good with tires aswell. The 89' 300ZX is a screaming bargain, coming in under 13K. The Elise Sport 190 is also a good bargain at 37K.
I pulled this definition from a web search.
"coupe:
An enclosed single-compartment body with two doors and varying passenger capacity depending on seat arrangements. The SAE standard J1100 defines it as having less than 33 cubic feet (934 liters) of interior volume. Larger coupes have rear quarter windows. Coupes have fixed permanent back panels and top, as well as a luggage compartment in the rear deck. Originally it meant a vehicle which was "cut" (thus the French "coupé") by a glass partition behind the front seats so that the driver was exposed to the air while those in the back were enclosed."
Technically the 2 door Imprezza is a coupe.
Depending on your interpertation of "Coupes have fixed permanent back panels and top, as well as a luggage compartment in the rear deck." may or may not exclude any car having a hatchback.
The best would probably be either a used RX-7 (FD) can be found for around 13k credits, though a newer one will give you better handling. Either of the last generation Camaros would work well, or the Mustang GT. It could be hard to beat a used GTR though.
(no, the City doesn't count) 
