DW has an importer that will move all your content over. It doesn't work as well now as it has in the past because LJ has changed some of their code, but it should still work well enough to get you transferred over. You really do want to watch the official communities, because they are good about telling us what's going on behind the scenes.

Crossposting is really easy, once you link accounts (as you have to do to import your old stuff) you can check a ticky box to have it import over here accidentally.

I would love to have you on DW--it's my primary home, and I much prefer it--but fair warning, DW gets spam too (although generally a lot less). The best way of avoiding spam on any blogging service? Turn off anonymous commenting