When buying leads it's worth spending the extra on good quality ones (you don't want to drop out in the middle of a song, or worse get loud crackling noises). Buy the longest leads you can and don't be tempted to make your own unless you really know what you're doing and use the proper lo noise co-ax. Finally, buy the flourescent orange/yellow/pink ones because they are much easier to keep hold of at a gig. Black ones will always go walkies with all the people that are usually milling around at the end and you'll never notice till its too late.