Gimp is a very good open source program, it is very powerful.
It is tricky to learn and use though, there is little or no coverage of using it in the mainstream photo magazines although I am sure most of the techniques they cover will be supported in Gimp.
It really depends whether you want to follow magazine articles with ease when it comes to editting an manipulating photos, if you do then Photoshop Elements would in my opinion be a better choice. As I said ealier in the thread second hand copies can be picked up from Amazon sellers at a reasonable price.
You can get a trial version of Elements 8 from
here