Not usually a Mac user myself, but I'd imagine it's fairly easy. At a guess;
Popcorn Hour a200 or a210 (�150-�200) with cat5 to Router/Switch. Cat5 from Mac to Router/Switch. Optical from PCH to 562. Configure 562 for source. HDMI from PCH to TV. Bonjour. Share the drive on which reside your DVD rips. Let PCH know where this is. You should be pretty much be good to go. 3 iPhone remote apps for PCH as far as I know. (I'd imagine Dune is much the same).
One drive is going to be pretty tight for Blu-rays. You could add a drive to the PCH and copy your films over. Support is being tested fo 3TB drives according to
this link.