a) Actiontec is the only current manufacturer of MOCA capable routers. If you don't have FIOS-TV, then you can have your WAN connection provisioned over cat5 and use any router you wish. If you have FIOS-TV, there are still ways you can run your own router, but you will still need the Actiontec or a MOCA bridge. What are the tradeoffs between the various router configurations
b) Not without an upgrade fee. $99 for the latest router. $40 to upgrade from a 160GB to 500GB DVR.
c) IPv6 was supposed to be available in 4Q2012. Supposedly, IPv6 is still in internal testing. There is support for IPV6 in the rev. I Actiontec, but it is not currently enabled.
BTW, nice wall of text. Ever hear of paragraph breaks?