Gold. Lots of gold. I set the mineral amount to 'sparse', just so you know I'm not cheating or anything. My stockpiles are literally overflowing with gold bars, and I have gold goblets ranging in value from 300 to 1200 dwarfbucks each. I have so much gold, I can't build a drawbridge because it's in the way.
Wait a second...
I have a better idea...
I'm going to make my fortress out of gold! Or at least, the entrance/main floor.
I'm going for a different sort of fortress design, with three downward staircases and hallways of structures. At the entrance, there will be a large drawbridge, two guardhouses, and eventually, a trade depot. There will be a 4 wide staircase leading down into the fort, which I might later replace with a ramp. My engravers are smoothing the entire first floor. Straight ahead is the main stairway, which will lead to recreational rooms, the dining hall, more permanent offices, and when the time comes, the throne room. On the right is the workshop area, with an alternating pattern of workshop/stockpile/stockpile/workshop, which will all be linked up for maximum efficiency. On the left, there are the living quarters, each room is 3x4, and will include a cabinet, a chest, and a bed. They to will be smoothed. Each section contains a large, downward staircase, with finely crafted doors, in case the need to seal them off arises. I'm right next to a volcano, so the magma forges are operating at 100% efficiency to pump out gold.
Finally, it's all smelted.
"You have struck native gold!"
AAAAAAHHHHHHH