Don't do it...
I had a Sony 400 disc DVD/CD Changer. At first, there was definately a WOW factor, but after some use I quickly discovered that it really is a slow process to navigate through all of your titles. The processors in them seem to be a little slower than what I would find acceptable. Even with the search option I was not happy with mine. The exception to this would be if you had an external control system (Crestron, AMX or others) that would do the actual catalog of discs for you and control the changer. That's just my two cents, I sold mine on eBay after the WOW factor wore off.