The issue of running direct or through a preamp is routinely debated. I believe you will know which you prefer only after you've heard both in your system.
As far as CD sources, there are a few outstanding used values presently: Modwright Sony 999ES Platinum Signature (<$1500), APL Denon 3910 w/DAC (<$2900), Audio Aero Capitole SE ($3500). Of the three, the APL will allow you to run direct. Frankly, I think this is almost a no-brainer if the seller can guarantee the Denon transport is trouble free. The Audio Aero may also have the direct feature, but I'm not certain.
You can also put together a really nice transport/DAC combo these days for <$2000.
As far as CD sources, there are a few outstanding used values presently: Modwright Sony 999ES Platinum Signature (<$1500), APL Denon 3910 w/DAC (<$2900), Audio Aero Capitole SE ($3500). Of the three, the APL will allow you to run direct. Frankly, I think this is almost a no-brainer if the seller can guarantee the Denon transport is trouble free. The Audio Aero may also have the direct feature, but I'm not certain.
You can also put together a really nice transport/DAC combo these days for <$2000.

