One you can afford – seriously. 

Look at how much you earn. What can you put aside for a trip? What are you prepared to sacrifice to make your trip a reality? Maybe you’ve been saving for a while and have a few thousand dollars in the bank. You do? Great. Well that’s your realistic budget. If you want to fly to Europe tomorrow and you only have ten dollars in the bank then you are not being realistic. But it might be » Read more: What is a Realistic Budget for Traveling?