Berlyn, what a bummer that you totaled your SLK 350! I have an older SLK230 and I love it. It's small, but you don't feel like you're in a tiny car, the hardtop convertible is great, and it gets wonderful gas mileage! Tiny cars rock!
Thanks for all of your replies, I am now 99% sure I am going to get a mini cooper s - sidewalk convertible.
It will be better for driving in London! The boxster can wait for a few more years. It takes 3 months from ordering, will post pics when it arrives!