Tubby,
I would have to disagree with the suggestions made by Herman on the USB DAC for your computer. Doing so is no better than recommending you continue to use your current source and upgrade the DAC. Your system is still only going to be as good as your source. Even the worst Wal-Mart Special is better than most computer drives due to interference from other components and feedback from power supplies, fans, computer monitors and the like. If you are using a laptop, completely forget the idea. Most CD-Rom and DVD-Rom drives under most of the major names that make it into a large majority of computers are made by a single company based in China. I would much rather see you purchase a decent source component with its own internal DAC's than follow this suggestion. This is no different than the recommendation you would receive from me on the discussion of using your computer as a music server versus an external one passing through it’s own or external DAC's. You are still limited by the computers hardware at some point in the chain and suffice it to say, even the best computer audio components were never actually designed for or derived from actual audio components.
I would have to disagree with the suggestions made by Herman on the USB DAC for your computer. Doing so is no better than recommending you continue to use your current source and upgrade the DAC. Your system is still only going to be as good as your source. Even the worst Wal-Mart Special is better than most computer drives due to interference from other components and feedback from power supplies, fans, computer monitors and the like. If you are using a laptop, completely forget the idea. Most CD-Rom and DVD-Rom drives under most of the major names that make it into a large majority of computers are made by a single company based in China. I would much rather see you purchase a decent source component with its own internal DAC's than follow this suggestion. This is no different than the recommendation you would receive from me on the discussion of using your computer as a music server versus an external one passing through it’s own or external DAC's. You are still limited by the computers hardware at some point in the chain and suffice it to say, even the best computer audio components were never actually designed for or derived from actual audio components.