jennblake,
As for me, I use a MacPro with Snow Leopard (10.6) and Safari 5.0.3 (which is the last version to work with Snow Leopard). Any further upgrade to either OS or Safari would require me to upgade rather expensive music applications, which I am not willing to do. If your re-design now forces the user to upgrade to later versions of either, then I would say it was a bad decision to re-design an already completely functional business site. So, if the answer is going to be I need to upgrade Safari, which would require a upgrade to my OS, then my response would be to reduce my wishlist here and probably do much less shopping here. Which is a shame really, because some of the best vendors reside here - Applejack, Rhiannon, Dreamland, 3D-Age, powerage, kaleya, outoftouch, and Sabby, Silver, nikisatez, nirvy, and a host of others. You know, just because someone cuts a new road through the forest doesn't necessarily mean it will lead to a better place. The road we had was well-paved and well-traveled for a reason.