Thinking about routes...

I've been thinking a lot about what direction we should travel in, and where to start.
I thought it would be good to start in Tibet and travel east,
But someone suggested to me that I should start in Delhi, then travel through Nepal (adding extra weeks to my trip)instead.
But, im not sure if Im already taking on too much, and adding more places is over-complicating things...?
On the other hand the more places to see the better, and it is easier and cheaper to fly into Delhi...???
Also been doing a lot of thinking about going to OZ.
I've been doing some research about working holiday visas.
JW is 28, and apparently you cannot get a working holiday visa if you are over 30, that only gives us (well, him) a couple of years before we wont be able to do it at all.
Also with him being South African, we have to apply for his British citizenship before we go (figured it would make travel a lot easier if we are both on a British passport) it costs crazy money, and kinda feels like its a chunk out of what we could be spending on travel.
Although, I know I wouldnt want to do this without him (what fun would it be on my own?)