You guys make it sound too complicated.
The bottom line is that if you have the latest version of Safari and the latest OS you should have no problem with 99.99% of web sites. And the majority of those that you do encounter problems on can be viewed through IE.
So . . . since the upside of having a Mac is the use of the Mac OS, there is absolutely no reason to not get a Mac because of some fear of bad Internet browsing. In fact, when you get your new Mac, you'll see that you are moving along much faster using Safari -- so the upside is huge, the downside minimal.