As for racks, I think the Tubus Cargo for 28 inch wheels would be the best buy. If you want something cheaper, the Blackburn EX (not the mtn) is still pretty good. I cannot see if you have eyelets for mudguards at the front. They would be nice to have. Beyond this, I think there are no obvious concerns with your bike. Even the gearing will be ok as long as you avoid the hilliest parts of the world, and avoid taking too much luggage. Keep it under 15 kg, and preferably under 12.
The trick will be to not take too much luggage so all will fit into rear panniers only. If you need front panniers as well, that would be the expense for a rack and panniers again, plus another 2-2.5 kilo. So avoid that, and spend the money on getting lighter and more compact gear. The new Ortlieb City Line waterproof panniers are a quarter lighter and a quarter cheaper than the Classic Backrollers, so get the City Line rear panniers. They are outstanding value for money and indestructable quality.
Willem