not read all this thread
but having owned all 3 in the past
VR. 8v. 16v
i can confirm theirs hardly owt in it but if a decent 16v comes up go for that.. but if it comes down to a mint 8v or tatty 16v, then choose the 8v
my old 8v lump was very healthy and would match any standard 16v i came across at the lights
my 16v (had 2) were very slightly better in the top end of the rev range and also on top end MPH but not by much