Ok, time to really comment on the whole deal!
First off, I really feel that discounting non-flash users is a bad design choice. It may be the case that your current user base has these things installed, but you will certainly not attract anyone with the "conform or else" mthodology. I for one refuse to do business with any company that doesnt have a cross-browser capable web site. I had a big run-in with timerlodgesteakhouse last year. I wanted to get a gift cert online and all I got was a lowsy "Get IE or Else" type message. I RUN LINUX AT HOME!
Second, As far as you can't do that in DHTML, well perhaps not 100%, but from what I can see in IE (at work) you can do about 90 - 95% of it with animated gifs / DHTML. A little effort will go a long ways.
Finally, I've got a 1969 Fiat 124 Spider (1438 cc) and would actually consider looking into your products. But alas, as I don't have a box at home with IE, I'll never be able to buy from you. I guess www.international-auto.com
, or www.fiatparts.com
can get my business instead.