I don't know that I could choose just one - in fact, I'm pretty sure it isn't possible. Since I've started my obsession (because there is no other word for it) I've owned at least two and have been up to three at a time. My dream dream BMW would have to be a 507. I'd also want a 3.0cs, a 328 (the original) an M6 (original & new - you can't be a carbon fiber roof), an M5 (E39 & E60), E30 M3, 2002tii (like one I had but with a few less issues), M-Coupe & M-Roadster (current and past incarnations) and did I mention a Z8? Yeah, one of those too and while I know it may be a bit off, I also want a K1200R Naked bike (and not just because I get to say "naked" all the time) . . . 0-60 in 2.6 seconds? Yeah buddy! See, I can't pick just one! If I had to only have one, I would go with the current M5. I could take the family with me and still haul some serious butt!

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MWBBMW
2006 X3 3.0i Highland Green Metallic, Sand Beige Montana Leather, Steptronic, Premium Pkg, Cold Weather Package, Privacy Glass, Xenon Headlights
2007 328i 6-speed, Black Sapphire Metallic, Sport package, Black Leatherette, Heated Seats, iPod & USB Adapter
If God had intended man to walk or fly, he would not have made BMWs!