[Kelberon]

I would say to keep it as 3.5. Without getting into any feelings on D&D 4.0, it's just more practical to finish it in the edition you know. And if you like 4.0 enough to make a 4.0 edition, then you won't just have the new system to draw on, but also feedback from other people on the 3.5 edition, to use for improvements.