You're after a bike to carry loads of kit by the sounds of it. IMO this rules out the Planet X bike suggested and some of the lighter tourers which are more like Audax bikes.
I have a 2009 Sutra, and it's a really nice bike. However, for heavy touring there are some things to think about.
1. Gear ratios. I needed to swap the standard road triple chainset out for MTB gearing. Much better.
2. Stopping power. Rim brakes are ok, but BB7 (road) are better. The Kona is pretty versatile in that it still has canti bosses so it gives you the option of using rim brakes in an emergency.
The Surly LHT is a bit odd looking but also a really nice bike to ride. Really stable but AFAIA your only option is rim brakes. The smaller frames are 26" wheels only, but 700c for the larger frames. Most places do them as a custom build I think, but they do tend to be that bit more expensive.
Galaxies are nice bikes and £800ish is a good price. I guess it depends on whether you're set on disc brakes or not. The Galaxy has (IMO) more appropriate gearing and decent components but think about whether you're happy with Cantilever brakes down a steep hill with a fully loaded tourer. Consider the stopping power in the wet.
I'd hold out to try the Sutra if you have time. It's not perfect, but pretty close. Try as many as you can before buying as always.