Of your current iDevice users. Ignoring the development of mobile browsing would be a pretty large mistake, in my opinion, especially considering the content of the site.
To each their own, I suppose.
You mention that 8% of your users are using 1024px wide displays, and yet that isn’t large enough a number for concern? 8% is a massive number that I wouldn’t ignore. Sure, it might be a lot of work to make changes and fixes, but the goal should be a perfect user experience for the most people possible, to ensure that everyone keeps on coming back.