I've not used the YN560 guns so cannot comment on them
I would however recommend the Yongnuo YN565EX flash guns. I have two and I'm over the moon with them. Good build quality ETTL, work flawlessly with the 7D/60D wireless transmitter.
The only downside is they will not work as Master and have no HSS.
Coupled with the with the RF-603c triggers I consider them to be an excellent addition to my photographic kit. An additional benifit of these triggers is they will act as remote camera release. I've not checked the maximum working distance, but I've used them at 7-10 metres.
I can recommend this Ebay company as I've bought a number of items from them.
http://www.ebay.co.uk/itm/ws/eBayISA...E:L:OU:GB:1123
Harry