Jolida JD9 Opamps

I've been following all the info about different opamps available for this unit and after awhile it all becomes a bit confusing. I've had my JD9 for a year now and I'm quite pleased with it but would also like to improve it if possible. I'm not handy with a soldering iron so changing the opamps would seem to be the route for me. I'm using a Denon DL-304 LOMC with very low output (.18mv) so I would like to keep the noise floor as low as possible. Could someone give me guidance as to which opamps would be best to use in my setup? Or should I just leave it be and enjoy it as is?
Regards, Sam