@stef75: Given your frame you probably will need a compound with a very large draw length available; having a good balance in hand and anchoring points for a quiver in the riser would also be valauble assets. Some examples:
Athens Peak 38 has a 27.5" to 33.5" DL adjustable with rotating mods, good balance, very good finish quality, attachment points for a quiver and is comparatively unexpensive compared to other models (not sure about availability in Aus, tho), 38" ATA.
PSE Evo NXT 35 LD goes from 26.5" to 32" DL (maybe risky if you didn't test your DL before) from two years ago, no longer in production but maybe you still could find one. Very good balance and affordable, nice quality, very smooth draw, rotating mods with adjustable DL and let off. 35" ATA.
Mathews Atlas: from 29.5" to 34" DL, comes with #75 peak limbs and the DL, let off and poundage are adjusted with individual mods (so you need to buy a new set of mods if you want to change any of those values, but you can set your bow from ~#50 to ~#80 just swaping mods and playing with the limb screws. Well balanced, more expensive, was released last year, still in production. 34.75" ATA.
Hoyt Highline: from 29" to 34" (with two different rotating mods, not sure about the settings of each one), just released, Hoyt's response to the Atlas, still few reviews available. 36.5" ATA.
Bowtech Revolt XL: 27.5" to 33" DL, is the most compact model of the list with 33" ATA; is also the most adjustable one, with rotating modules, flip disc and adjustable cam lean just using an allen wrench. Excellent finish (the best in the list along the Athens) but maybe the string angle won't be that good for you based on your size.
There's a few other long DL bows as the Prime Black 9 (39" ATA) but most of those are mainly target bows with no support for quivers (you still can use adaptors for the sigth screws, but I would go with the listed ones instead).
Related to poundage and hunting, checks the laws since it can vary; anyway as reference any big game in America has been harvested with traditional bows and poundage as low as #40. Obviously compounds are faster and I won't go with that against a water buffalo, but being realistic shoot placement adds much more to lethality than raw force.