Video: Streaming Vs Progressive Download

I'm trying to decide whether, for my particular application, I would be better off delivering video via streaming or progressive download. Here's the situation: Background: this will be a learning drill for learning foreign language phrases. There will be a series of ten short video clips, each one a headshot of a native speaker, saying a single sentence. The background is static so the only thing changing will be facial expressions, so compression should be pretty effective. Each clip will be approximately 4-6 seconds total length. Resolution will be approximately 360 X 270.

The way this particular drill works makes me wonder if perhaps progressive downloading might make more sense than streaming. But like I said, I'm not a Flash developer, so I could easily be wrong. (Did I mention we're currently looking for a talented, reliable Flash developer?) So here's how it will work: Drill will load up showing written text of instructions, along with audio of the narrator reading the instructions aloud. Approximate length of the audio instructions will be 15 seconds. (I"m thinking progressive download could begin during the reading of the instructions.)

After the instructions have been read, the intructional text goes away and is replaced with (from top to bottom) the text for the first sentence, the video box with a static image of the first frame, a "Begin" button. When the user clicks the "Begin" button, the video begins to play, and the "Begin" button transforms into a "Repeat" button, which is inactive while the video plays. When the video ends, the "Repeat" button becomes active. Clicking the "Repeat Button" causes the same video clip to play a second time (again, the "Repeat" button is inactive while video plays.