Hi Mark,
I've been a Salomon fan for quite a while, and have had about 4 pairs or so of Synapse, mid and low. When they seemed to vanish from the market, I managed to grab a pair of low cut on ebay in my size, but not many out there any more sadly. These have been an excellent bushwalking shoe for me.
This year, I did the Larapinta and my Synapses were not new enough for that. The X-Ultras are my go to wet weather hiking boot but I think they would be too warm for desert walking so I scoured the internet looking for options. Surprisingly, I found that Salomon has a hot weather 'aero' version of the X-Ultra, but it strangely wasn't available in Australia. ??? It has a wide weave mesh fabric upper with the usual external strengthening supports.
http://www.salomon.com/us/product/x-ultra-mid-aero.htmlKnowing my X-Ultra sizing, I ordered a pair via ebay and they have been excellent. I've walked the Larapinta in them and basically haven't used anything else since. They are holding up really well. Walking through wet grass, my feet get wet in them but they dry out pretty fast though. Walking through sandy creek beds I do get some fine sand coming through the open weave fabric but not enough to stop to empty the boots so far.
Sorry about the dirty boots! You can see they are being used, lol.

Check the lack of major wear on the soles. The heels on my boots are where the wear shows the most. I was expecting they would be pretty much knocked up after the Larapinta, but they could easily do it again.