I just wanted to point out here that there is an active DF Worldgen community over at www.reddit.com/r/dfworldgen :-) , I'm going to try to crosspost between the two but I like the Reddit layout too much to want to close the commnity. I mean, we're bigger than /r/jesus now :p
I'll need a field guide; I don't use reddit so it's a bit baffling for me.
I did manage to use PerfectWorld to gen a...fit, of sorts. Aesthetically, it's ugly...VERY rocky and mountainous, but it has everything I want.
Native Copper, Tetrahedrite, Hematite, Obsidian, and Flux stone all visible plainly from the surface, along with clay and sand on site, trees, a river, and it's all joyous wilds. I don't know what the wealth or underground are like, and I believe there's an aquifer along half the embark, but if anyone wants it I'll post the seed.
EDIT: Seems to be a fair number of Haunted/Joyous biomes bordering each other in places.
EDIT2: Man, this embark is ridiculously laggy. I'm wondering if there's something going on in the caverns I can't see, since the magma pipe has inadvertently revealed them, in a way: I can't see in the caverns, but clearly they count as discovered or something because I have cave moss growing in my underground soil. I usually run a 5x5 embark at 200+ FPS without issues for the first couple years, even with running water on site. Yet I've barely done any digging, and haven't messed with the river at ALL and I'm frequently getting lag spikes where the game hangs for a few seconds before updating, and my FPS is down to 110. Granted that's still good, but to lose half my usual rate this early in (it's not even winter of the initial year) has me VERY worried about the long-term life of this fortress.
I could post the seeds and see if someone could find a likely culprit if they've heard of this behavior before; otherwise I'll just try to find a better site and keep at it.