The T.R.U.C.K. (I think I cheated a little with the acronym by using the word kerbaled instead of manned) is my submission, beating the Polar Aurora in both cost, mass, and part count. Price: $125,094 Crew Capacity: 1 Mass: 52.5t Longest Dimension: Width, 8.3 meters Part Count: 135 Special: Room for 30,000 ore