Magique, the Bugaboo Bees are excellent, but the Mamas and Papas Urbo is another excellent light-weight city stroller. Lots of great designs too! Good from birth and can both be parent facing, which is why I'd never have a city mini for my from birth buggy, I hate not having them facing me for at least the first 6 months.
LittleGrey, I would avoid all side by side maclarens and the like. They're cheap but crazy wide, difficult to push and end up killing your back. I like the Oyster Max 2 as a good, solid, cheap double. They're quite heavy, but very sturdy and not too big. They're basically an iCandy ripoff!