[edit] Brilliant idea I just had! I am going to give call them and get back to this thread afterwards.
I would suggest Camera's Inc in Arlington. 781-648-8111. Ask for Gagin or Wayne. I have done lots of business with them over the years and they have always been fair and honest. It's possible they do installations for their own customers only, I don't know. If they try to sell you expensive speaker wire and interconnects don't buy into it. They would not be trying to rip you off, I think they really believe it makes a difference. Tell them you have a budget of say $500 for wires and interconnects. Let me know how it goes.
Nick