I went with dBpoweramp based on the recommendations here. I needed a way to convert apple lossless files to FLAC to use in my car.

Nowadays, I use it to rip the occasional CD to FLAC files which I import into Sooloos on an MC600. It is a great program and easy to use. It also seems to do a better job of pulling album art than Sooloos (even when Sooloos was supported).

Theater: 861v4_LPS, 818v3, HD621, Oppo 203, Lumagen Pro, DSP8000SE, DSP5500C, SW1600x2, DSP5500, Epson 6040UB, PS4
Living room: 861v4_LPS, HD621, DSP8000SE, DSP5200C, Oppo 203, Lumagen 2143, 818v3, Sooloos/MC600 Bluesound Node
Bedroom: M80
office: G68D, DSP6000
Garage: DSP5000
Storage: M33s, DSP33s, DSP5k, 501, 518, M1500, G98DH, SW1600