Yeah, I agree, the evaporation issue on Zippos is one downside to them, but as a non-smoker I, myself, don't mind it. But for smokers (or pyrofreak such as I) that like the classic look of a Zippo but without the evaporation issue, the Z-Plus butane ligher insert is a great choice.
P.S. If you don't mind me asking, what is a IMCO?
Thanks for your interest in my collection. When I have time I'll be sure to upload some pics!
P.P.S- if you have time, I would love to see your collection!