Did the Black Sea, Georgia, Azerbaijan, Caspian Sea, Kazakhstan and Uzbekistan thing last summer. The visa situation has improved considerably, as you can now get them online (depending on your passport of course). You have to mindful of the weather and time of year as you go from the murderous heat of eastern Uzbekistan to the cool/cold weather of the mountains. You also have to be careful with your water, be prepared to carry at least 10 liters just to be save. Highly recommended.