You don't need much RAM for what you do (2 GB is fine, 4 GB is morthan adequate).
The speed of TV'and video is fixed (you don't want movies to run 30 minutes if they normally take 90). For browsing, finally, most often the connection to your ISP is limiting.

Taken all together I'd spend any money you have left after buying 4 GB of RAM in a faster processor.

Kees