Which multi-CD player is best?

I would suggest a different approach. Instead of a multi-CD player, use a computer hard drive. You can rip your entire collection to a hard drive, uncompressed. Then, take the signal out of the computer in digital through the USB port, feed it to an Apogee Mini-Dac and then into your integrated amp. This will give you incredible sound and incredible convenience. No more discs. Your family can scroll through titles on a computer screen and have all four hundred CD's at their disposal at the click of a mouse. You can get an Apogee Mini-Dac for around $1,000. You'll be amazed at the sound quality. Detailed, accurate, musical, and amazingly natural.

You could simply add a quailty free-standing DAC to your current changer (if it has a digital out connection). Use quality digital cable and possible add a jitter reduction (Monarchy DIP). The add-on DAC either with/without jitter resuction unit would like yield better results than any 400 disc changer that I know of....

Enjoy,

TIC

If hardrive filling and backup sounds like to much work consider...
mega changers toslink into Benchmark DAC1($1k).This way down the road you would have a very flexible headphone monitor,passive preamp,dac in your stable.Of course you can subsitute dac of choice.I do this in the HT system with really good results and may go the harddrive route when more self contained fanless products enter the mainstream.