I use an Asus Xonar U7, and enjoy it. It can be had for $90 or so. There are many Fiio units available from $20 on up, which do a good job as well. Are they better than the laptop sound? Yes, generally. Are they enough to warrant the purchase price? Depends on what you get, and how much it costs of course! I got mine because it enables me to select between optical out for my 5.1 system and rca out for my 2-channel system, as well as a built-in headphone amplifier which sounds very nice to my ears.