I got my copy of Photoshop CS4 for $299 (US) instead of the regular $999. How? I bought the Wacom Bamboo tablet which had Photoshop Elements 5 included. Once I loaded Elements I got an online offer to upgrade for $299. That was a no-brainer.
But why Photoshop?
Well it was cheap and CS4 is pretty good and simple even for me.
Here’s Scott Kelby and friends on why CS4: http://www.scottkelby.com/blog/2009/archives/2871