I've owned several including the Musical Fidelity CD/Pre-24 and the Quad 99 CDP. The MF CD/pre-24 has a lot of additional functionality, including analog inputs, digital inputs and full blown pre-amp functionality. The Quad is sonically much better (IMHO) but has less functionality with only 6 digital inputs and remote controlled variable volume control.
So, in my book the Quad 99 CDP is King! It is sonically very good and it has digital inputs and variable volume control. If you only have digital sources, the Quad will allow you to get rid of a seperate pre-amp completely and connect the Quad directly to a power amp.
The Quad is $1495 new and sells for about $850-1050 used. Yes, it is outside of your price range, but if you also use it to replace an expensive pre-amp, it becomes a great value.
Enjoy,
TIC