My advice is to not be in a hurry to 'complete' your collection and focus and enjoy the hunt, I think that is much more rewarding than the end goal itself.

I have a similar goal to yours - my collection is one chip from every Las Vegas casino that ever existed and had chips.

In the past 3 years, through all sorts of methods (conventions, ebay, ChipChat, Spinetti's, postings here on TheChipboard, etc.), I've whittled down from 200 to the point where I just need 16 chips (many Z+).

I realize some may never be obtained, but that doesn't stop me from looking everywhere I can, since I really view the interactions with people as one of the best parts of this hobby.