MikeD,
The last time I looked at pay-per-impression (which was a long time ago) it was something like 30 or 40 cents per 1000 impressions. If you would be getting this kind of traffic (1000 impressions), I would think you would make more money with Adsense. Therefore, my recommendation is to stick with Adsense.
How much traffic/impressions are you getting per day?
Also, you can experiment with Adsense ad placement... some spots on the page are better/more noticeable, and as a result, you would get higher click through.
Sherif
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