Since this is going to be a secondary car, get an s2000 over a 3 series, seriously. A 3 series is a sports sedan, meaning that it has to give up some concessions to have everyday practicality. But the S2000 is a true sports car. Drive these cars side by side and you'll never look back. And the well-known F20 powerplant in the S2000 is way more reliable than anything BMW has built in recent times. It's an engine built to rev, it'll take anything you throw at it. Handling is incredible as well, it's very popular in japan on those touge courses. Imagine it as the miata for people with more money.
I've never understood the notion that a sedan was practical.
Van = Practical, Stationwagon = Practical, Hatchback = Practical, Sedan /= Practical.
Even once you lower the seats, the maximum size of the object is reduced to the height of the boot - its pointless! And at my age, I still have all my hair, but with the weather being nice and rainy in my city, I'd prefer a coupe of a convertible anyday.
Yes yes yes, everyone agrees that a 3-series coupe is a glorified sedan, because its the truth, its a brilliant sedan chassis, and it gets away with being a good enough coupe chassis once you make it a 2 door, but that's ok.
Anyway, if a convertibles seats folded down, I couldn't see it being any 'less' practical than a sedan/coupe (I'd imagine they can't because of structural rigidity reasons, but you can have very tall things in the back seats - no roof and all).
its all moot really, since I have access to a Van and a Truck (Mercedes ML '11), and my hatchback has successfully moved almost all my stuff from one location to another before, granted filly up passenger seat, rear seats folded flat, and not being able to see out the back at all, but it did alright.
I know someone would introduce the 200SX some time or another - what about the 300ZX? There ust to be a red one across the road from me when I was a kid, amazing looking thing, some of them are quite fast too, they'd also easily fit under a $20k price roof... of course they could also be modified, which is a worry, but I'm sure there'd be some left that aren't.