Thanks for the suggestions TheKnife, I'm sure they'd both be good choices!
The purpose of this thread has progresed now, and I'm wondering what you guys are using yourselves as the base 'layer' of your kit. OR whether indeed with your different experiences and needs you've developed other systems
The philosophy of use is a knife which will be the main knife, but not 'the one', rather it is the foundation, on which you could add a machete or a light axe if needed. The reason I'm opting for this strategy is because 'the one knife philosophy' ends up at the logical conclusion of a ten inch blade in order that it can chop properly. However, the problem with a ten inch blade is that it's not practical to carry around for a lot of my activities.
I like long distance running and hiking (could be up to 40 miles in 24 hours so weight is an issue).
I like sailing, (which again makes a battle mistress perhaps not the most effective choice

)
I'm also planning long desert trek in the medium term