I've had a good chance to play with all of the Rode video mics, and each variation has it's place.
For recording a scene that's got various sources (a brass band) you'll want some form of XY stereo setup.
Rode's stereo videomic and the pro version fit the fill, and sit roughly in the price range! The normal video mics will be too directional to get the full range of instruments.
Alternatively, if you have a idevice (iPod or iPhone) the iXY from Rode plugs straight in, records broadcast quality, and you're not limited to placing it where the camera is.
Syncing in post is easy these days, and often worth the trouble