Yamaha 5840 is decent. I just bought myself that same receiver. The Harmon's may be rated as 50W but keep in mind they are a true high current receiver. Most receivers that say 100W+ are not. They are indeed good, but to me not worth it for a starter budget system.
I myself am peicing together my speaker system 2 speakers at a time. Only have 2 bookshelfs right now. If I were to get a package, I would get
http://www.futureshop.ca/catalog/pro...0030004&catid=
Those speakers are a great deal right now. The next package I'd look at is
http://www.futureshop.ca/catalog/pro...0058491&catid= but is more pricey.