In your shoes, I would take way number one. That would give you WR from 18mm to 300mm at once, with only two lenses, and you might find you don't need anything else.
Then, when you have sufficient funds built up, replace the 18-55mm with something else if that's still what you want to do. Most people would go with the 18-135mm or 16-85mm, and both of those would give you a little bit of overlap, but the 16-85mm is significantly more expensive. With the telephoto end already well covered, only you can decide whether you need the extra wide angle field of view between 16mm and 18mm or the alleged increase in image quality the 16-85 gives (I say
alleged because I don't own one and can't speak for it, while the 18-135 has been good enough for me so far). The only way to determine that is to spend a while with the two-lens combination and see if you are always taking a step back to get more in at 18mm (in which case the 16-85mm would probably benefit you). The other thing to consider is how often you're changing from one lens to the other, and at what focal lengths (so you can determine how much overlap you need or want).
If you don't mind a bit of a gap in coverage, and you believe everything that's said about the image quality and build quality, the 20-40mm Limited might be a consideration for the wide end. But that's quite an expensive lens for the narrow focal range it covers. Before you get something like that, I'd shoot with the 18-55/55-300 combination for a while and see what focal lengths you were using on a regular basis.
---------- Post added 28-12-15 at 12:22 ----------
Originally posted by pearsaab I wouldn't be in too much of a hurry to believe that "Discontinued" business. It comes up all the time here, and people keep on knocking it on the head. It seems to be a marketing gimmick designed to make you buy in a panic.