I acquired the French Rosetta Stone software and it isn't as good as other language tools. Obviously living in France is the best (but that'll cost more than $300). But I think audio, DVD and software is the best because pronunciation is a huge part.
The Rosetta Stone starts off well with basic "man, woman, boy, girl" but within 5 screens you're on "The woman is riding on the horse". And that's a little bit of a big jump. Remember that each screen has 4 words / phrases! And it doesn't come with translations. It's purely pictures and the French words. So working out sentence structure is a little tricky.
I think there's a Rosetta Stone demo you can download. Maybe give that a go first. For $300 I wouldn't recommend it.