Re: round the world
I always believe in booking yourself on the internet. But I think for something like this you should deffo go to trailfinders.
Price will be about 1500-1600 and include o good few countries. You choose your way around the world. The limit is not to fly more than 30,000 miles.
Here is a sample of what they offer
Dublin - Delhi - surface - Mumbai - Singapore - Hanoi - surface - Ho Chi Minh City - Sydney - Christchurch - surface - Auckland - The Cook Islands - Tahiti - Los Angeles - surface - San Fransisco - Dublin
from €1537 inc taxes and charges*+
See the following link