Tonyptony - There are several great threads here on PC audio. Also, Audioengr (Steve Nugent from Empirical Audio) is an expert in this area and has excellent information on his website. I suggest you check this out. I heard a couple of Squeezebox set-ups at RMAF and was impressed, but not enough to ditch my transport/dac. I believe the future of digital audio is going in this direction, but its not there yet. We're just at the tip of the ice berg.
Distortion - TRL charges a standard fee of $550 for their mods. Do not ask what they do, they won't tell. If you're one of those that needs to know everything that is done to a modified unit then TRL is not for you. They offer a money back guarantee if you're not satisfied with their work. Check out my review on the TRL Audio Mirror here and you'll get an idea of what type of improvements you can expect.
Distortion - TRL charges a standard fee of $550 for their mods. Do not ask what they do, they won't tell. If you're one of those that needs to know everything that is done to a modified unit then TRL is not for you. They offer a money back guarantee if you're not satisfied with their work. Check out my review on the TRL Audio Mirror here and you'll get an idea of what type of improvements you can expect.