tbh I am a little confused by your requirements. You mention low graphic games, music editing, webcam/mic, and storage space. If you take out the sound system from the equation, you can easily find a laptop that would accomplish these tasks for a fraction of the price of the hp envy. Actually if online pool is the type of game your brother wants to play, I would even go as far as to recommend a NETbook. I recently stumbled upon the eee pc 1215n netbook that has good enough specs to play world of warcraft as well as starcraft 2. It gives you good battery life and its quite a lot cheaper 
If you actually do want something that matches the envy's performance (which is quite high for such a light machine), I would say look into the macbook pro 15 (it comes with student discount) sony vaio z ( amazing machine but crappy sound system ) alienware m11x (a gamers portable rig ). All of these variants are more expensive than the envy but they come with a better brand name. Envy has a good price tag for what it offers.