Another thing to consider...are you planning on installing and setting up your own r&p? If so all the usual sources are fine, if you are going to pay a pro to set it up for you then consider buying an entire chunk as a bolt-in. The labor costs for a diff setup can be kind of high, you can often save a lot on labor by buying the parts from the same source.
Currie and Perogie will sell complete chunks, but there's probably local sources as well.