Join the cult of Brompton. Get a Brompton H-Type. Not only will you enjoy riding it, you'll amaze family and friends at how quickly and small it folds up. It's an award winning design and 80% of the parts are manufactured solely for it. They're handmade in England and they're built to last. The steel sections of the frame are brazed not welded so the bike will last you a life time.
You can build you own on their website, with an interactive webpage;
Bike Builder | Brompton Bicycle