I bought the Kenko extension tubes recently and think they're alright for your first taste at macro. The advantage over a diopter is being no glass which in theory should affect the quality of your shot less. If shooting indoors I wouldn't imagine shooting without a tripod. I've just been using a small tripod that's about 20cm high and manually focusing.
The set of three is enough to have a good range of distances to choose from. I've got a Canon who also produces extension tubes but for a considerable amount more with no noticeable difference between the builds. Just check whatever tubes you do for that they're compatible with your lenses. The kenko set don't work with EF-S lenses on the Canon.
Not sure what else you'd use extension tubes for other than macro. Your ability to focus to infinity is gone while having the tubes on the camera.
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