If we look beyond the Beo CD5500, the Philips CD650 is the hands-down winner, and if you compare its circuit diagrams with those of the Beo CD5500, you can see the exclusive family lineage.
The circuitry is almost identical, but component wise, B&O went one up on the Philips CD650, and used polypropylene decoupling caps for the TDA1541 DAC, instead of scratchy ceramics on the Philips.
I have done extensive mods on my CD650 - the sound causes instant drooling and tendencies to listen to music for hours-on-end - very dangerous, and so I'm NOT in the market for any new CD player at any price :-)
So, if you can find a Beo CD5500, definitely the first choice, but if not, a Philips CD650 will satisfy you immensely.
Check this ebay number - didn't sell - you may be able to cut a deal with the seller - 370264981246
And most importantly, spares (and service tips) are readily available for both these units.
Menahem
Learn from the mistakes of others - you'll not live long enough to make them all yourself!