<< the DLINK site shows a 20 dollar MIR for the 704 and 704P but it also says NOT VALID AT BEST BUY. what are the $20 and $30 MIR being offered?? >>
Best Buy has it's own rebates as stated by Boiler above.
<< I know there are 4 ports, but is there a 5th port for the uplink to the cable modem or do you have to use one of the 4 ports? >>
There is a broadband port for your DSL or Cable modem in addition to the other 4 ports.
I have this router from the last time this went on sale 3 weeks ago. I would jump on this deal. I might even get another. As for the reliablilty and ease of setup, I can't comment on that as I have yet to install this thing. Judging by the consensus, this is a decent router that is simple to use and configure.
My 2 cents.