I'm sure you've made a good choice - the Zoom H2 will do a fine job in the application you described. I use one to record my local art group.
However, there's no doubt that the Zoom H4n achieves higher audio quality - you get better detail and stereo imaging from its internal mics and if you use external condensers with it you can easily achieve studio quality. The downside, of course, is that it costs quite a lot more.
Paul
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