skip all the in between options.
If you are on a budget try:
http://www.gadgetinfinity.com/home.php?cat=274 from this page (which is mostly the same as the ebay ones)
If you are not on a budget or if you require the flash firing EVERY single time then go with the pocket wizards.
I find with the cheap ones I got between 1-3 misfires for every 20 images. Also depends on the lens you are using and how far away you are from the lights.