I suicided my last fort. It was glorious. 20-some immigrants were recruited into the magma-death room and died in one fell swoop; from then on I was short on pumping labor (I needed all 5 of my pumps manned...er, dwarfed at once since I didn't bother setting up a power source) so I just used the drawbridge over the lava to whack dwarves whenever I could. Tantrums, several melancholies and a berserk ensued. Eventually I had just 2 melancholies and one pissed but functional dwarf. The melancholies suicided, and I managed to get the last guy to pull the drawbridge lever and then stand on it (it was the meeting zone) just before it opened.
My new fort is an Atlas Shrugged-type challenge. The starting seven will go it by themselves, creating a paradise on the top of a rugged mountain far from their civilization. All immigrants will be deathtrapped (unless one shows up with a particularly interesting skill set, in which case he will be allowed to join) and caravans will be traded with at first (since commerce is a respectable skill....and I need an anvil....but the goal is self sufficiency.) Each dwarf will design and build their own palace and they'll work together for necessities of life, common areas, defenses and so on.
I used the feature finder to find a 6x6, mountain biome with a little bit of badlands (luckily, there's sand there), a brook, magma pipe, bottomless pit, circus, and flux. Happily, I arrived to find many copper and hematite veins just poking out of the ground waiting to be dug, so the ore industry will be booming and many a suit of fine armor will be forged.
I may do a mountaintop fortress, or I may dig into the bottomless pit and build a glass tower inside it, then flood the whole thing.
And I just realized - although I want to train them all in combat, I have to watch closely and make sure they don't get Elite status so they can still work! None of them will be able to be that good of fighters.