My purchases influenced from GT would be:
Dodge Viper GTS, RT/10, GTS-R
Panoz GTR
Nissan 350Z
Skylines
Supras
RX-7s
Ford GT-90, GT40
Toyota RSC
Cadillac Cien
Citroen Xsara Rally
G37
Lancers
Imprezas
From NFS:
Shelby Cobra Daytona Coupe
Shelby GT-500, including Super Snake
Chevrolet Corvette Z06 & ZR1
Dodge Viper ACR
BMW Z4
Holden
Porsche Panamera
Audi TT
Aston Martin Vantage, One-77, DBS
Yur So Fast (reminds me of a Stirling Moss)
BMW M3
Super Blitzen (yellow reminded me of an Apollo)
Bentley Continental
Ferraris for the most part (and Outrun: Coast 2 Coast)
Lamborghinis
Porsches
McLarens
Mercedes SL, SLR McLaren
Burnout Paradise:
'10 Camaro SS
From Supercar Street Challenge:
Saleen S7
From Midnight Club:
Lotus Exige
From Driver:
'60s Mustang Boss, which in conjunction with Dukes of Hazzards drove my like for old boxy muscle cars, like the Road Runner.
From Dirt3:
Ford Fiesta Ken Block
Impreza GRB
From Test Drive:
Dodge Viper again
From Cars the Movie:
White-walled tires
Super Bee
Hudson Hornet
Old Cruisers
From Initial D/Wangan Midnight:
AE86 Corollas
Datsin 240Z
There's another whole bunch influenced by NFS but I'm way too sleepy to list it all