I would like to suggest a couple of cars and some cars that should be replace. All of this cars come from TDM(TheDanishMaster)
*Replacements*
Corvette ZR1 to replace corvette
(http://i.imgur.com/AtgOuHa.jpg)
(http://i.imgur.com/ZnZj362.jpg)
(http://i.imgur.com/osQLsXn.jpg)
(http://i.imgur.com/Z0VGcaM.jpg)
Dodge Charger to replace current Dodge Charger
TDM Bus to replace bus
(http://i.imgur.com/POSAwOa.jpg)
(http://i.imgur.com/bAllan6.jpg)
(http://i.imgur.com/bAllan6.jpg)
Mustang boss to replace shelby (this could be added also)
(http://i.imgur.com/ejZzPfk.jpg)
(http://i.imgur.com/xC8oQ1f.jpg)
(http://i.imgur.com/marhWcZ.jpg)
*To Be Added*
McLaren MP4
(http://i.imgur.com/Czp5cJQ.jpg)
(http://i.imgur.com/cXmYc7W.jpg)
(http://i.imgur.com/u0VVlQF.jpg) (http://imgur.com/u0VVlQF)
(http://i.imgur.com/FXiEwtJ.jpg)
Camaro ZL1
(http://i.imgur.com/s9Nuihg.jpg)
(http://i.imgur.com/5d1Lciw.jpg)
(http://i.imgur.com/n5rj9nD.jpg)
(http://i.imgur.com/trYGKiu.jpg)
(http://i.imgur.com/u02Wm9G.jpg) (http://imgur.com/u02Wm9G)
Lamborghini Reventon
(http://i.imgur.com/5stlvp2.jpg)
(http://i.imgur.com/cgzD8QH.jpg)
(http://i.imgur.com/GzERCbM.jpg)
(http://i.imgur.com/BK9sSWD.jpg)
Nissan 350z
(http://i.imgur.com/IwDEN3f.jpg)
(http://i.imgur.com/0Xj582s.jpg)
(http://i.imgur.com/4fz38pG.jpg)
(http://i.imgur.com/xi1QrVc.jpg)
GT-F SpecV
(http://i.imgur.com/tT4W4iu.jpg)
(http://i.imgur.com/wqXgzdN.jpg)
(http://i.imgur.com/nJZeeit.jpg)
(http://i.imgur.com/U5zDyxG.jpg)
Mazada RX8
(http://i.imgur.com/CjdCzfb.jpg)
(http://i.imgur.com/cXygP2G.jpg)
(http://i.imgur.com/gwzJySt.jpg)
(http://i.imgur.com/VhRItgf.jpg)
Chevlle SS
(http://i.imgur.com/rUaf9su.jpg)
(http://i.imgur.com/jmB7Ynb.jpg)
(http://i.imgur.com/epOzzdU.jpg)
Hudson Hornet (New)
(http://i.imgur.com/qVM7Lec.jpg)
(http://i.imgur.com/QluiUZT.jpg)
(http://i.imgur.com/I5dKezC.jpg)
(http://i.imgur.com/F0mW08A.jpg)
Ford Deluxe (New)
(http://i.imgur.com/u7GVQcC.jpg)
(http://i.imgur.com/ofWm27K.jpg)
(http://i.imgur.com/2kM6lEc.jpg)
(http://i.imgur.com/kJ48r9u.jpg)
Dodge Ram (New)
(http://i.imgur.com/N0EVx3x.jpg)
(http://i.imgur.com/0Hlt6H0.jpg)
(http://i.imgur.com/nwZTNub.jpg)
(http://i.imgur.com/NeNrLKA.jpg)
Ford GT (New)
(http://i.imgur.com/Xi2zuTv.jpg)
(http://i.imgur.com/1inZYBQ.jpg)
(http://i.imgur.com/uWczqNd.jpg)
(http://i.imgur.com/pSpd7pt.jpg)
300C (New)
(http://i.imgur.com/7nBxZW3.jpg)
(http://i.imgur.com/ETefrBC.jpg)
(http://i.imgur.com/44fmc8d.jpg)
(http://i.imgur.com/Ik9M9Mz.jpg)
More cars will be added. Please free feel to post more cars.
I can also make simple skins for these cars. Basic colors.