Actually, I think that's
480i
Anyway, you'd probably want one of the Movie Studio 10 HD versions. Looks like the "production suite" version simply includes Soundforge + effects and tracks if you want to fool around with audio editing.
IIRC, from back in the day when it was still owned by Sonic Foundry, Soundforge was pretty kickass audio editing software.
edit:
Before paying for stuff, you might honestly try Windows Movie Maker. Your description sounds pretty simple, and something that WMM
should be able to handle.