The 10 best Lego vehicles. Lego Technic Unimog. Price: Â£154.99. Ages: 11-16. Model no: 8110. The biggest, most complicated Lego Technic set on sale consists of 2,048 pieces, meaning that building it will keep you occupied at least until the cold turkey sandwiches are ready on Boxing Day. Once it's built, the Unimog will amaze visiting relatives with its electrically powered pneumatics, which can be used to operate the crane.