Cain, The Novarossi and Werks engines will last longer than the SH made engines. The SH/Sportwerks (these are the same engine) are a little faster on the top end but I haven't seen one last very long. The Italian engine typically have better materials and bearings.
The OS VG .21 is coming too. I have always been a big fan of the good ol' RG so I have high hopes for the new model too.