Upgrading Behringer BCD2000 project, need help/advice

So let me introduce you to the project.
I got around to disassembling this "thing" last night. I bought it several years ago for some fun MP3 mixing, I know, I was young.

So when all the parts were laying there in all their nakedness, I decided to take a loupe and take a look at the parts that made it possible for me to enjoy music for the past few years.

The DAC appeared to be a 24 bit DAC, which was a suprise to me. The opamps are of the lowest quality possible said google.

I also have problems with pops when a lightswitch is turned on/off. So the PSU has to be upgraded as well.

My plan is to upgrade the parts (opamps, caps, etc) but to keep the boards.
All opamps (6 total) are from Cool Audio and all caps are from Xunda.

Here are some pics for you to see what's going on:

PSU:




DAC:




Front board:




I already decided to replace all opamps with LME49720's (but if you have a better idea, please let me know!), now I just need your advice on what caps to upgrade and what PSU parts to replace

hey buddy, you'd better ask on diyaudio.com eh?

Yeah, might as well do that. Though I'm keeping it up here because the DIY section here has some awesome folks too!

You need one of these :

this thing costs 180 EUR in a shop...why not selling it on marktplaats or ebay for like 120...add 30 bucks and order an STX from HK?

when I was about to mod my M-Audio Audiophile USB w/ LM4562....I quickly came to the conclusion that modding old gear is pointless.

It was already broken on some knobs, the pots of a few rotary things didn't react properly.
The DAC + amp part still works fine, but I thought I might as well upgrade some parts when I'm going to fit it in a DIY wooden enclosure.

So it's more of a fun project, something to learn a few things from

Anybody?