Shopping for a new netbook or laptop...

Hoping to get some advice. I'm not very computer savvy. I'm looking for a netbook simply to listen to internet radio and browse the web. I'll hook it up to my 2 channel system via USB cable and external DAC. Borrowed my wife's work laptop today to listen to Pandora. Are there any critical hardware components or performance specs I should be looking for? Will the quality of the computer's sound card have any effect on things? Don't really see myself downloading music files etc, so don't think I need a huge hard drive (but maybe I should). Thanks in advance for your time and input. If something recent on this topic has already been posted, please let me know. I missed it, if so. Thanks again.