looking for a replacement for my Harman Kardon AVR4500 av amp. It sounds very good, but i need a couple of things : video up conversion (composite to s-video, both up to component at some point) sockets for rear centre speaker (i have no space for external power amps) possibility of a network connection so i can stream output of my pc? VITALLY important are at least front and centre preouts. I know the network one might be a problem but is there anything out there? Budget- well assuming £200 for the HK, then £500 Thanks guys! sorry for confusing bullet points- silly software!!