Audioengr can probably tell you whether it is okay to go with Transit (optical out only) as a starter unit or that you have to use one of his mods to obtain acceptable quality.
Have you decided on the DAC? If you end up with a DAC with USB input (e.g. mini DAC, Grace 902), you may not need the converter at all. However, you do have more options with a converter.
Have you decided on the DAC? If you end up with a DAC with USB input (e.g. mini DAC, Grace 902), you may not need the converter at all. However, you do have more options with a converter.