I'm still a little on the fence. I was first considering the "E" version, since I mostly want to use it for landscape work and possibly some commercial work. However, I could see using it for photographing large groups, of which I do a fair amount of. Sometimes groups of 100 or more individuals, and I'm a little concerned about moire in this instance. I would certainly hate to have to retouch moire on a 100 individuals in one photograph! (Most of these are uniformed groups - so if one has moire, they probably all will)!
I also photograph a lot of interiors and architecture. Although the extra sharpness would be welcome, the moire could be more prominent here, so again... the non E version may be the better choice.
I want to see some RAW files with examples of moire before I make my final decision, but as it sits right now, I think the non-E will suit me better.