Laos is amazing. Fiji is paradise, just like you see on postcards. Thailand really good. Personally i didnt think too much of new zealand, once you've seen a few days of mountains and lakes they kind of become boring. Same goes for temples in thailand
For £2000 you could have any holiday you like, granted not stupidly expensive hotels but for the money you can do a liveaboard dive boat in australia on the reef with levels up to dive master certification, spend months in thailand, do all of the east coast of australia, fly into bangkok and do thailand, laos, vietnam and cambodia then malasia...