tools for easily generating slide presentations?

I'm looking around for something that makes it easy to make a nice-looking video that's similar to a PowerPoint presentation. Unfortunately most IMers only sell stuff for a week or two, and then you're out-of-luck, so if you want something and aren't getting a bunch of promo emails for it this week, it can be hard to find if you don't know of any names (which I don't).

I'm watching one that's a bunch of rather short (<5min) videos with a static background frame and text that slides onto the page while the guy is talking. It's his voice, not a fake voice, and the slides are timed so what he's saying is being shown on the page, then it clears and the next bunch of text shows up. To me, this is like a podcast with subtitles, and it's quite boring. The guy has no graphics or photos or anything other than text. Boring.

The other end of the spectrum is making slides in PowerPoint, then using Camtasia to record my voice and the screen while I go through the whole presentation, as if I'm doing it live. The main drawback with that is ... I think you need to present in smaller chunks, maybe no more than 10 mins.

Anyway, I'm curious what's out there to help make videos like this of presentations that could be up to an hour long (in total time).

As an aside, I'd love to find something similar to Prezi but cheaper. I like how it lets you zoom in and out of several topics on one slide rather than having to add a long series of slides.