Little chance of upgrading any time soon but this version does what we need it to do. I wish I could take a course on it as I'm sure there are many things that could make my job a WHOLE lot easier that I'm not utilizing.
CS5 will do WAY more than you need.
Have fun.....sounds like it is your solution.
If you are looking to learn more about Photoshop or in your case, CS5, I suggest that you get on http://kelbytraining.com/ and pay for a month or 2 and look at the Photoshop instructional videos. No need to go take a class.
It also has Web Design vids and Wordpress vids.
It is all there.
For free, YouTube has a bunch of instructional vids.