A lot of Oz natives here have mentioned that they can get away with a lot less tent than, say, someone in Scotland. Doesn't it tend to be hot and dry there? Thus TarpTents tend to be popular. Great conditions for a single-walled tent. Likewise, unlike others, I understand the need to carry a lot of water on most of that continent. But, geez, you're worried about the durability of a Platypus? Those things are nigh indestructable (though I like the Evernew stuff, myself).
I'll take the opportnuity to pimp the Sawyer filters over the Hyperflow. Ahem. The Hyperflow has gotten some horrible reviews, though they were a few years ago, so perhaps the newer model is better. I LOVE my Sawyer. I use the 4-way filter in their dedicated bottle, so I just have to scoop and keep walking. If I have to carry more water I carry it "dirty". But, again, I'm not hiking in a desert. It's also not a pump filter, so it can be hard to share unless you rig it as a gravity filter, thus loosing the scoop-and-go functionality that I like.
I love Mike- big hug, Mike- but a lot of people like trek poles. You have to know how to use them to get any real benefit from them, though, beyond just balance-aids. But, mind you, sometimes its really nice to have them as balance aids, too. Google "nordic walking." Sometimes I use them, and sometimes not. Of course, if you get a tent that uses them as poles, you're kind of committed. I also have a hiking staff that doubles as a center-pole when I'm using my pyramid tent. Unlike trek poles, though, a staff is pretty much purely a balance aid.
I have an Osprey Exos (among many others) and I like it. If you want a pack that is indestrucable, though, I don't think that's it. I'd take a decent cottage UL pack over it on durability any day. The suspension works well (though many others would disagree) but since it uses a lot of mesh under tension I can't help but think that small tears will propagate wildly, or more likely that the spot where the cloth folds over the frame spars under tension will be a high-wear area. I use mine as a winter/high-volume pack, for when I have to carry a lot of insulation in various forms. Seriously, look at the bigger ULA and MLD packs. They are made of Dyneema-X and/or ripstop just like the mainstream packs, though slightly thinner than the heavy mainstream packs, and are plently durable. They tend to be frameless, though, so when you start pushing 30 pounds load they can get uncomfortable.
Another nice thing about simple, cottage packs is thatt they tend to be cheaper, so that if you DO destroy one it doesn't hurt so much to replace it.