thank you everybody for all your responses, has been very helpful. but i have still yet not made a decision haha.
i have decided to ditch the air integration, and keep gear cost effective and simple. less maintainence etc. i also always carry a small spg on me as i don't fully trust the transmitter and for other reasons, so yes the extra transmitter is something that is not required.
i am interested in the petrel. if it is worth the extra money. i don't like the idea of carrying AA batteries around with me though as appose to the smaller standard batteries. I'm guessing on islands like the gilis and lembongan batteries are going to be hard to come by.
i have also decided linking the computer to my mac is no real big deal either, as to be honest i don't ever see me using it and getting any real advantage from it.
i have now also been recommended suunto zoop by many instructors/guides around asia, saying majority of guides use suunto and they are very user friendly. only reason i decided not to go suunto was due to their algorithm, but if majority of guides in asia are using them then i see no problem using one swell.
i am still also interested in the dg03 but it does not sound very user friendly.
so i guess I'm down to about those three:
the petrel 1000 aud
suunto zoop 230 aud/suunto vyper 300 aud
dg03 300 aud
i am now leaning more towards the suunto due to apparently more user friendly, more reliable, cheap, widely available and used, and can still get a bungee mount from dss, well i hope they post to australia?
thanks again everyone
only 8 more weeks for me!!!