I have both Photoshop CS4 with Lightroom and Corel PaintShop Photo Pro X3. I also use a Wacom Pen Tablet. While I have both PS and Corel, I find that Corel is more user friendly and intuitive. You can dive right in and start using Corel without any training, and it has all the same features as PS.
Corel PaintShop Photo Pro X3 also includes Painter4 and HD Video Projects, and you can also work with RAW.
As a matter of fact, I have an extra, unopened brand new Corel PaintShop Photo Pro X3 if you are interested. It retails for $53, but you can have it for $40.