im traveling to USA soon and i want to be able to get pictures of buildings and monuments so im looking at either the 9-18mm or the 11-22mm which would be best for this stuff.

Im also taking over with me 14-54,40-140(or if i get it in time 70-300 but then i wouldnt take the 40-150) and maybe a 35mm or i might buy that in the US, they are much cheaper than here in thats for sure.

and should i wait till im in the US to get the new lenses or get them here?? do the lenses have an international warrenty or just country of purchase warrenty?

if i do purchase them in the US do i have to pay tax on them when i come back into Australia?