09-06-2010 05:18 PM
There is no 'best' to answer your questions specifically, as what you are looking for, most computers are capable of doing.
1 - Downloading of music means having a good internet connection, which isn't computer specific. Just the same, you should be looking for a computer with ample hard drive space to store your music and possibly a CD/DVD writer to take your music to work or in the car (assuming you don't have an MP3 player).
2 - Watching movies online begs the question of what quality the movies are you're watching. Youtube standard definition movies can play back on a netbook with little to no issue, but once you up the quality of the movie to 720P or even 1080p, a netbook may not be able to keep pace. If the highest quality, 1080p movies are what you are looking for, then ensuring you have a dual core processor with a minimum of 4GB of ram should do the trick. If you have a sample of a movie you wish to be able to watch, bring it to the store with you and try it out on a laptop you're interested in. If it plays back well, then you're good to go.
3 - Video chat merely requires a web cam built into the laptop. This seems to be a standard feature in most laptops these days, only difference is the degree of quality. Higher end cameras offer a higher MP (Megapixel) count which means a clearer picture for the person on the other end, but requires more bandwidth on your (and their) internet connection. Equally, a lower end one isn't as bandwidth intensive but also isn't as clear.
Long story short -- there is no wrong answer in whichever you choose as a laptop, generally you get what you pay for. Aiming for a mid-range price will get you what you need and spending more will merely increase the experience.