I've used a bunch, though not for a year or two.
Constant contact was the cheapest with reasonable reporting. Campaigner was better at the time, but a little more dough (still not a lot, like $25-50 a month).
Clickspace is a local company with a very good product, but it's much more money.
The key is to make sure you can customize templates (or have them created) and get user level reporting.
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