Hey there, sorry that you are having so much trouble with your new mac. I am in the UK and suspect that things are different in the US, emails to the supposed steve jobs email address just dont work, if you want to get this sorted you have to go the correct channels for uk customer support.
I experienced a similar issue last year.
Basic details:
bought mac pro that turned out to be faulty within 3 weeks, they tried to repair it and it came back to me in a terrible state, they tried 2 more times to repair it and failed, they wanted to keep stringing me along, but I spoke to the right people and got a brand new replacement and £800 worth of compensation (£200 cash and £600 worth of apple products).
My mac pro cost me £3k so the 'good will' they offered me reflected that, as such I wouldn't expect the same amount for an imac, however they too tried to fob me off with ipod cases etc at first.
HOWEVER...the people I spoke to were very good to me and I wouldn't want to recommend anything outside of PM'ing (seems a bit unfair on the customer service people you know?). So, if you want any help with it, PM me and i'll let you know what I did last year.
Its awful when stuff like this happens to such a new product, and really puts a big fat smudge on something that (at least in my case) had been really well researched and also well anticipated. Either way I hope you get it sorted.