I have the 150 F4 and I have to admit that I am a little disappointed with the minimum focal distance of it. My version also has a problem, where it doesn't fire the flash (which I will get fixed...hopefully).
Also, any reason why the 110 F4.5 PS is so much more expensive then the F4 version?
The f4.5 close focuses to .37m and delivers 1/1 without a tube. Believe it also has a larger 72mm filter size. It was around US$2150 new and about 400 now if you can find one.
150/3.5 would be my recommendation. I have both S and PS versions of 150mm and 3.5S version has definitely more pleasing character (OoF, smooth contrasts, etc. etc.). haven't noticed any difference in sharpness between the two.
for tight close-ups S-16 extension tube is the way to go.