Albright Knot.
Over the years I've tried several different knots and found these to work the best for me. Weather using Braid or Mono as a main line, I like to use a long shock leader. I like to tie my leader directly to my main line..Mainly because I've broken many rod guides pulling a swivel thru them. I have found the Albright Knot to work best for this.. It takes some practice, but before you know it..you'll be tying it with your eyes closed.. Give it a try..I've been using it for years and haven't had a failure..
http://www.powerpro.com/using/albright.asp
I don't use the lock that they show in that link, works fine without it..