Best Codec/Quality for 2 GB Movie

Hi All

If i want to convert a 2 Gb Movie, which Codec did i get the best result with - .wmv, normal .mpg4 or .mpg4 H.264.

And still let the settings for Bits/Pixel be between 0.3 and 0.4 right??!

I get the best piture for a given bitrate/file size with H.264. You should too with .3-.4 bits/pixel.

But what is the diffrent between .mpg4 and .mpg4 H.264 - is H.264 a kind of a “HD” resulution?