I second the over 30s thread! I hang out there a lot, too, although I don't post much, mostly lurk. But there are LOTS of modders and faceup artists and sewers and they leave really great tips on how to do this and that. Plus, they're all really nice. No drama on that thread, no sir!
And the marketplace is addicting. Yes, sometimes you have to wait awhile to find what you want. I'm still looking for a Delf Miyu head, although with Fairyland's new 60cm line coming out, I'm keeping my fingers crossed they'll be re-releasing all the Delf sculpts since they own the rights, and the Delfs are what got me into this hobby in the first place.
However, I've gotten my last several dolls off the DOA marketplace, and at good prices, too. I just follow the thread until they drop the price to a reasonable level, then PM if nobody snaps it up ahead of time. Like my 50cm Obitsu. I'd been stalking the thread, hoping nobody would buy, but couldn't buy right away so had to wait a few months. Well, she ended up knocking another $40 off the price, right around the same time I finally had the money to buy the doll. I PMed immediately. Had the doll in hand in three days (she lived close and shipped immediately). lol Patience was definitely a virtue there.