I know this is ultimately only a question I can answer... but I figured I'd throw it out there for comment. First, a little background. I just sold my Delorean I've had for 14 years to (partially) fund the Model S (I'm trolling the inventory cars for the right model). I also have an 2002 BMW M5 (E39), and a 2010 BMW Z4 335i (both standard transmissions). Now that I have room in the garage the Delorean freed up, I'm hot to get a MS. As it is now, I primarily drive the M5 in the late fall to early spring, and then switch over to the Z4 for the warmer months. I also have winter wheels/tires on the M5, so it's my "winter" car as well (I live in New England). When I get an MS, I'm afraid that I'll be wanting to drive it pretty much all the time, except when the weather is real bad, I'll use the M5 in ice and snow weather. That leaves the Z4 sitting alone, pretty much unused year-round. I guess maybe once or twice on really nice days, I'd take it out just because. On the other hand, I could easy sell it for $35k to further fund the MS, and/or upgrade to a higher spec MS than I was planning on (85 to P85 or P85 to P85+, I haven't decided yet!). Last week during a warm spell, I took the Z4 out for a few days, and I forgot how much of a kick in the ass that car is -- it's so much fun to drive (even with the top up)! It made me question if I really want to sell it. But that brings me back to "would I ever really drive it enough to justify keeping it".. while I continue to pay insurance and depreciation each year I keep it. I know you're thinking "sell the M5, and keep the Z4!".. but that's the problem.. the M5 isn't really worth all that much anymore (compared to the Z4), so it's actually much more valuable for me to keep it as the "winter" car and keep the MS safe in the garage during those really nasty storms -- like what's happening now!. I'm also a manual-trans nut.. I really enjoy the connected/active driving feeling. I've already read most/all of the threads here that talk about all you manual-to-MS "converts".. so you can spare me on that, but I'm sure I'd miss that in the Z4 on a nice summer day with the top down. Anyway, if you read this far, what would you do? Keep the Z4 just to have it around sometimes, or sell it and upgrade the MS I'd buy? If you are in my position and have a sporty convertible, how much do you drive it now that you have an MS? thanks.