If your videos are not too raunchy, TribalFusion could pick you up there. Unfortunately humor sites have a hard time landing good ad networks, due to the target market of visitors. But if Tribal picks you up, you're probably at the best you can do. Then have Tribal begin defaulting down.
In most cases, TribalFusion will always be the best bet for sites on SitePoint. I still use them (though one tier down), and I am always impressed with how well they do.
But yeah, like you've seen a lot around here, Burst, Casale and ValueClick are also nice, and, if you can get TribalFusion, have it default down to one of those.
I know a couple big (top 10K alexa) sites that still use Casale strictly for their pops, which are supposedly paying nicely this time of year.
So, as a funny video site, you'd have a good chain with
That would pretty much cover all your impressions in best way possible.
*Oh, and, if you start getting over 500K page impressions per month (not awstats, but real google analytics impressions), then you should see about getting an invite to BlogAds. Pays less, but you can have them and normal ads.