STTR Timbaland version has grown on me and I like it now. The ultimate version probably would be all the mixes we know merged into one. I still think Timbaland could have done a bit better and use the song to it's full potential, for example the beat is a bit "generic" for me and he didn't take advantage of the bridge to build up the song (like the Tricky mix did), 2:50-3:06 is great, but he should have continued this path, and NOT treat the following vocals as a normal verse. The best Timbaland version so far is from the "hologram performance" for me.
Also, BG has grown on me, the "fast beats/slow down beats" part was all over the place for me at first, but I like it now.
Overall, I think every song on the album has some (sometimes minor) elements which would need to be cut imo to be perfect.