Thanks for everyone's feedback. With more of us looking we might just find what we need out there.
There are a few things that we need to look for:
1) Ideally it should be a PFD type 1, so that we cover all bases. A type 1 has neck support and is designed to keep you floating face upwards with your head above water. Some of these great options that have been sent in are Type 2 and 3
2) There has to be freedom of movement under the arms, due to the nature of our paddling stroke.
3) Ideally it should be 1 single system, but if we cannot find one we need to find 2 components that fit well together.
4) It needs to be light (some of these gas filled ones are simply too heavy)
5) It needs to be affordable.
Imo, the Pinnacle II is too expensive (A$1499) and looks like it could be restrictive on the sides
the Trek is too expensive (A$2260) and looks like it could also be restrictive on the sides
The combo of the combination of the SOS 5114 and SOS Hydropack looks ok. I will try and get some prices on these. As they build gear for the military they may have what we are looking for.
The gear from Canoeing Downunder looks pretty good (and reasonably priced) but I could not find a Type 1 system.
This is what they have:
I will keep looking...