Recommendations for high quality EMI/RFI filter

[pacoarcade]

I'd like to buy a high quality EMI/RFI for improving my setup. I'm considering a general purpose double stage 6A filter, is it adequate? I don't mind spending more money if it's worth the price difference to get cleaner power for my boards.

I currently use the Prima Power PSU recommended by RGB with built-in filter, but I'd like to use a filter anyway, specially for my other RT-125A PSU.

 

[nio]

I got the Prima Power Psu too. what part of it is the filter? in mine there are some unpopulated holes. what are they good for?