There are really 2 kinds of thinking that I've noticed about this topic on different forums. I DEFINITELY agree with Brad C's comment...here's the 2 things I've always heard on this.
1. "Tune your snare with the snares "off", making it the highest in pitch. Adjust snare tension for sound"........BLAH!!! RUBBISH! hehehe I don't like this method.
2. Tune the toms at intervals that sound good, tune the bass in accordance with the sound of your toms (boomy, punchy, etc...), and tune the snare on it's own. To me, the snare is kind of on it's own. It and the bass are the 2 drums in a song that normally drive the tune. THERE ARE NO RULES. Unless I'm producing your million dollar album (keep me in mind someday hehe), there's no reason why I should be able to say you need to have a snare with a "crack", or a lot of "depth"......go with what you feel & hear, and try to make sure your personal tastes do the most important thing of all......compliment the song and style of music that you are playing.