you can probably keep your layout, although just how much work it might be i don't know because I didn't try. (I think - and I may be totally wrong about this - that the more of your layout that was originally custom coded, the easier it will be to move? but that might be wrong.) i know there are comms that talk about how to port over lj layouts, too.

i personally really like the crossposting system - easy, obvious, and it posts a little footer that keeps track of comments on DW for me. i also like the fact that when a bunch of trolls reported DW for paypal for hosting porn, rather than asking people to take it down, DW found a new company to handle their credit card business.