hi
unless you are planning on going somwhere where you can get a WHV i would suggest not planning to work. For your money to last the longest maybe just concentrate on the cheapest destinations. daily backpacker budgets for the different regions would be
South America - Bolivia, Peru, Ecuador, Venezuala......can be travelled on a budget of £35 a day
India - £25 -30 a day
SE east Asia....varies from country to country but approx £30 a day
other things to consider are....your own interests and the time of year you plan to go on your trip
