How about a companion for the LX cars and the RA? They don't really have direct comparisons with the other cars in LFS. In real life, you'll find a lot of Lotus Elise/Exige or VX220 cars at trackdays etc. Small, light, hardcore, mid-engined. As long as it handles better than the RA (which wouldn't take much doing!). That would make LFS complete for me.