IMO... $2K is good for some asian countries... Australia only if you are intend to go for 3-4 days since the air fare is already eating up your budget by half... not to forget accomodation another half of the remaining half... then food there is not cheap.
I suggest Bangkok, the ppl there are camera friendly and great city scape and landscape on the outskirts of Bangkok.
alternatively, taiwan is very good too both streets and landscape (especially).
and lastly, HK... but street photography there might be a challenge as the people there is like singaporeans... quite resistant to cameras point at their face especially old folks. landscape wise, not alot, but enough to keep you busy.