PS2 Versions are so confusing...

[hrtbrknhksnglby]

I know ppl have asked this a lot of times

I plan to mod my PS2:
serial - U1973112
NTSC - U/C
SCPH - 30001R

I looked at some sites and I still can't determine my model, please help.

Also, if you find out my version... Can you tell me the BEST mod for it? I plan to play PSone and PS2 backups, ALSO japanese games too. I'm not too good with soldering.
thanks again