the x5 is not an M5 turbo.

the X5 is an suv, the M5 is sedan

the new X5M or whatever the badge as is suppose to be getting a twin turbo V8 from what i've read not a twin turbo version of the naturally aspirated V10 from the M5

it'll be a heck of an suv

if the M6 new M3 are in your range i suggest also looking over at the 911 (996 and 997) turbos. similar price range and amazing to drive.

not sure if a pcar is your style (some people just don't really like them) but if they are and you need a place to read up on them see pro/cons of each generation etc let me know and i'll forward you some forum links