It is good to see these kind of threads, decisions about 1 or 2 lenses when fund is not sufficient and we have to decide wisely, don't you all hate to be in this situation where you have to choose 1-2 lenses out of many great lenses out there?
And how funny that you will never see all members are going to choose exact the same 2 lenses, human nature to be different.
Well, because i know i can't choose 1 or 2 i ended up to buy many so i will never be in that situation, i know not all can do that, but i wasn't rich either to get them all at once, but when i got them all i was always thinking wisely when i choose them one by one.
So again, the best 3 zooms out there are: 16-35, 24-70, 70-200, for the full frame or even for the crop, then what comes after those are lenses very very good as well, and i can mention them as: 10-22, 24-105, 17-55, 70-300, and 100-400.
I had 10-22[and still i have it] but now i think i will never use it because i use FF and pro bodies that can't take 10-22 directly, same mistake will happen if i bought 17-55, but i did bought L lenses and they live until now on all bodies, i feel happy that i bought something for future before i figure out that i will go FF or 1.3x bodies path, so that i keep telling this here to make people avoid mistakes, and if many of you buy cheap lenses of EF-s and you sell it again good reasonable price to fund another lens then you are all lucky, because here in my country, once i buy something then i have to forget to get it at very good price, and this making me to think why i did a mistake to buy something that i will get rid of it later, but this can happen even for those L glasses, but L glasses always have a big luck to stay longer than EF-s lenses, and also those more expensive fast L will live longer than those slower one such as 17-40 or 70-200 f4, believe me, if you buy 70-200 f2.8 you will never think about f4, same when i bought that 16-35 i never think about 17-40 even many said it is better quality than 16-35 mk1, but i will always think i want f2.8 or faster lens if i go with f4 lenses or slower, think about it.