[math-fun] ??? maple, mathematica, matlab ???

I hope to buy one of {maple, mathematica, mathlab} to run on a Macintosh I'm planning to buy in the near future. I'd like to hear preferences and reasons from any of you who have used more than one of these. (I've never used matlab, but find that mathematica's incessant need for typing capital letters to begin each built-in command, together with its uniformly mediocre help files -- at least compared with maple's -- cause me to lean toward maple over mathematica. But I'd love to hear others' opinions. I'm curious about breadth of features, ease of use, and quality of graphics. (Price is relevant, too.) --Dan