As a previous 8" LX200 owner I agree with Brendan. Go the wedge. If you can afford it go for the ultra wedge. The standard wedge really is too light and the Azimuth adjustment mechanism on it suck (to say the least).
I've not used a derotator, but you can't do piggy back using a derotator. I'm also fairly sure that even with a derotator there are some areas of the sky that don't work as well with it.
