Something that you will want to keep in mind when you are planning your wedding is being generous with all of the people that are helping you. To start with, the best friends that you have chosen to be in your wedding are very likely using a lot of their time, energy and money to help you. Show your appreciation and buy them gifts. Find something that would be perfect for each person individually.
If the men in the bridal party enjoy music or are part of a band, you can find some really groovy groomsmen gifts online. You can find electronics or gadgets that they can use to make music or you can actually buy sheet music, instruments or a large variety of other things that they will enjoy.