If you take photo editing really seriously you will not want o be without a graphics tablet.
Using a pen/stylus you can use the graphics tablet to edit some of the fine detail in your image, make detailed selections, and add your own artwork.
Have a look at some of the well-liked alternatives and see if it is for you.
Lower priced: In USA:
Middle Price:
High Price:
If you want to search further go to the Jessops site in the UK, and amazon.com in the USA.