Viewing in different browsers

I am currently viewing my pages in IE5.0 and Netscape 4.04 as tests to
determine if my pages will look reasonable under various circumstances.  Is
this sufficient (my thinking is that most are using IE5 or so, and Netscape
4.04 will show me how the pages degrade under older browsers)?  Should I be
testing under more browser versions than just these?  Particularly I am
concerned about N6 - I am wary of installing this on any of my business
machines. Generally, what are good 'tests' that can be used to assure the
client that their sites will look reasonable once it's on the web?

Any thoughts or comments would be appreciated.

regards,
Glenn

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