Nitrons are good, or consider Hyperpro emulsion both pretty near Ohlins quality without the price tag. Lots of XT660z Tenere owners fit Nitrons instead of the OE Sachs units that bike arrives with.
No offence to Hagon users, whilst they are good for gentle use on road bikes or classics, it mustn't be forgotten that they are very much built to a price.
I have actually been to Russia and done quite a few miles on the gravel roads there [all the ones marked yellow on roadmaps- in other words the majority of them] you will benefit from a decent rear shock.
If you do go, and it's much recommended as somewhere to go- watch out for rear chain and sprocket wear, my Scott oiler managed to turn a newly fitted & top quality rear chain into knicker elastic in 6k miles!
