I wanted to get more speedlites for portraiture work. I have been using continuous 500W hot lights and the Canon 430EXII. My budget was around $80 each, so i went with Yong Nuo 560 II.
The newer YN560III came with Yong Nuo's own remote trigger system at an added cost. The YN560II's were about 10 bucks cheaper, and available locally for AUD$72.00 plus shipping.