Buddy of mine owned the X for 4 years, traded it for the S, has had it for 2 years and says he wants to get rid of it for another X. He says the S handles slightly better at 100+ other than that he thinks the X is much better. I've driven both quite a bit and prefer the X (go figure). No experience with the RR, great looking car, but it's not going to perform like the Porsche or X even though straight line times are fairly close. RR also ranks highest on most problems per 100 vehicles. BMW doesn't build them like Toyota either, but you'll still probably have better luck.

If you have aspirations of traveling off-road though I'd rank them in reverse order of what I just said... but who really goes rock climbing in a 75k car?

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2005 ///M3 Competition / Interlagos Blue-Black /6spd/SS Race Exhaust/Angel Eyes/Passport HW/Mich. Super Sports Soles (love em)
2008 ///M3 Melb Red w/ Beige Novillo, Tech, Prem, & 19" (Retired)
2005 X5 4.4i Estoril/Grey Sport, Nav, DSP, Prem, Pano, etc. (Wifey's)
2007 335i Silver/Black SP,PP,CWP, Comfort access, & Sirius (Retired)
2001 X5 3.0i (Retired) Silver/Gray Sport w/19"/Prem/DSP/CWP
2002 YZF600R (Retired)