You should get rid of the corvette for the e39 m5, and buy the 7 seater with the left over money,

absolutely make sure you get fold down seats in the m5, my m5 did not have fold down seats and that was pretty much the reason i bought the x5 on a whim i havent looked back(since the m now belongs to my brother, which i live with, so i can drive it if i ever want to)

estoril blue 4.6 is such a unique suv, bright blue, great style