You may find this recent thread interesting/helpful, on which Browsers people currently test in... [webmasterworld.com...]
And to quote a couple of relevant points from that thread:
encyclo... Safari: I don't own a Mac, so most testing is in Konqueror with final verification on a borrowed machine. There's rarely any difference.
Testing for Safari is the hardest to achieve unless you're a Mac user, as the only way is to buy or borrow a Mac. However Konqueror is virtually identical (Safari is based on Konqueror's khtml core), and testing is easy with a live-CD of a KDE-based Linux distro.
SuzyUK... No Mac either but Safari Support is so similar to FF it hasn't really been a problem
Interesting statements about Konqueror. I actually do have a Linux box and I viewed the site in Konqueror and it looked nothing like the Safari screenshot I was given. I know Safari is based on Konqueror, but the page in question rendered *horribly* on Konqueror whereas it looked fine on Safari after a few tweaks.