Need Advice on a Low End CD Player Giant Killer

I'm on the lower end of audiophiledom - I have Paradigm speakers, an Outlaw receiver and a Sony multi-disc CD changer that had the first modification from Tube Research Labs.

My original intent was to send it back to TRL for them to do their latest modifications on it and tighten it up a bit since discs skip a lot or don't read well, but in doing my research online it seems there's a lot of controversy about TRL.

Basically I want to spend $500-$700 tops for a new or used CD player that's a giant killer. I'd love to have a modified multi-disc player if those exist that equal the sound quality of a single disc player, but I'm open. I need suggestions, and if anyone can give me any info on the work and honesty of TRL I'd appreciate it as well - I haven't updated my set-up in a LONG time but am ready to make a change.