I'm looking to buy a new touring bike. From what I understand, the most all-round bike should have 26" wheels, V-brakes and steel frame. Most touring bikes lack at least one of them.
I'm willing to spend up to 1500£ if necessary, but that would be half my budget so I'd like to stay lower.

I see a bunch of bikes sold for around 500£, are these of quality and would they hold up on tour (i.e. this list: tomsbiketrip.com/cheap-touring-bikes-for-low-budget-bicycle-adventures-a-growing-list/ ) I haven't toured before, but I'm contemplating on doing a several month long tour. Would such a bike hold up for this task?

If I'm buying a bike without either 26", V-brakes or steel frame; where should I compromise?

Lastly, do you know of any quality touring bikes out there with a reasonable price tag?