I've read that the Z4 M roadster kicks butt with +/- 254 kw of power. The Z4 3.0 si has 195 kw of power, 2.5 has 160 kw. Looks wise the Z4 has carried a love/hate badge for most - some say the same about our crossies!! I have the limited crossfire not srt 6. If I had to I would go for the Z4 - it apparently does handle better??!! Thoughts anyone?