A Return to DnD v3.5

I am currently working on converting the Five Come Together characters to DnD v3.5. As much as I like DnD v4, I'm finding it hard to judge encounter size and translate old (and well-loved) adventures. It might be hard for the wizard and cleric (because they'll have a greater range of spells/prayers to choose from) but the newbies might find it easier not having to worry about which power/exploit to use. I don't know. I guess we can just see how things go.