An Isic card is awesome to have. SO many student discounts out there! Unfortunately the only card i have is my international youth card. What type of hostels are you going to be staying at ? More independent ones or HI ones? Keep in mind that most yha hostels have curfews and lockouts (though they are extremely clean!) so you have to decide what type of hostels you want. The savings from members to non-members only very a few dollars. So depending on your length of trip it might not be worth it. i had a yha and it don't think it was worth it personally.
I have been to: Myanmar, Laos, Cambodia, Thailand, Vietnam, Singapore, New Zealand , Australia, Fiji, Costa Rica, United States, England, Ireland, Wales, Northern Ireland, Scotland , France, Italy, Switzerland, Germany, Austria, Vatican, Guatemala, Belize, Honduras, Nicaragua, El Salvador, Panama, Colombia, Mexico, India, Nepal.
Where to Next? Iceland!