If you are looking for floor standing speakers, I recommend MYTHOS1B. They retail @ about $1000 for a pair, so you should close within a 2500 for all 5. As far as receivers go, I've recently tried a few Onkyo TX-SR706 for a customer with a video distribution, and I have to tell you these puppies are the best in their price range. Farudja chip, audyssey eq, THX certified, the works. And the integration of the receiver (if you think to get a universal remote) is amazingly simple, since it pretty much has discrete codes for everything. Check these items out.
Also, if you are looking to get in-ceiling speakers, I have been using Niles audio 750DS series. They sound awesome, I have these in my setup. Remember the center channel is 750DSC and the rears 750DSFX. They are all directional speakers, so even though they are in the ceiling, you can aim them at the listening area for optimal experience. Good luck