I bought a stainless Springfield GI earlier this year as I wanted to have a nice pistol but not drop all the $$ at once on a Loaded or other model.
Since then I have done the following:
Extended thumb safety
Ed brown grip safety (took more time to fit/blend this than anything)
Mainspring housing, chainlink, flat
Hammer, trigger, sear fitted for crisp 4#
Appropriate springs for above
3 dot sights (staked front, NM rear...no mods to slide)
Basic deburring over the gun, no real polish on feed ramp or anything, it works well as is.
Then I taped off the brushed areas and re-blasted the places I had worked over on the frame and rear of slide, that was the most stomach churning part for me...just seems weird to put those nice pistol parts in the blaster.
Still working on getting the ejector right, I'm trying to get it to quit sending brass banging into the ejection port. I've heard many say that a lowered port is not needed if the ejector is right on, so I'm working towards that little by little. I may end up lowering and flaring it one day but it's been fun trying to get it just so. It hasn't stopped the gun from running but it does dent brass up.
I'm a machinist by trade and work closely with a gunsmith, so I have some experience and access to the proper tools. That made a big difference!