Thanks for all the response- definitely glad about the consensus of our budget. We will have some more back up funds, but we rather not touch that.
To answer a few questions:
Going from Turkey to Egypt-- via Syria (if situations calm down), Jordan, Lebanon. But if we run out of time, we can skip Egypt. Its not like the pyramids are going anywhere. However, I would love to make it to Petra.
The vagueness of "Eastern Europe"-- so many countries, so little time. Definitely on my to go lists are: Montenegro, Moldova....actually everywhere. We will go with the flow of things.
Caucasus-- yes planning to do that. These countries seem incredibly out of the way to go on a normal vacation to.
Visas- Only one of us will need a Chinese visa so that cuts a chunk of the cost. I am not sure what other visas costs are but will definitely look much more in depth into this matter as the time comes nearer.
China, HKG-- actually we are planning to relocate to HKG as one of us has citizenship & family there (hence the end point). So we are only really keen on seeing Western China via the Karakoram Highway.
Accommodation-- We am so over the hostel dorms (specifically the person writing this). Been there done that. We will be staying in private rooms in hostels, cheap hotels, airbnb...
Food-- I love street food, even if it goes out of my system too quickly. We are definitely not picky eaters and I love Asian food. So eating won't take a huge proportion of our budget.
On my previous trips (never quite as long as this), I have found that I am definitely not a fan of slow-travel. I am a huge fan of public transportation though. So hopefully us rushing through countries won't dent our budget too much.
Anyways Thanks Again!!!