Honestly, if you're wanting to get that deep into it, serious reloaders will only use one type of brass from the same manufacturing lot. Same with powders. In my experience, it's just not worth the hassle...
I would recommend option 1, by far and away. Use the smallest neck diameter that you have (of a loaded round) and then subtract .002 from there. That's your bushing size. Option 2 is not worth it to the vast majority of guys. I don't even use my Type S neck sizing dies anymore. I went back to sizing dies that come with the $30 RCBS sets from Cabela's. Crazy that my accuracy has been better than it ever was with neck sizing. YMMV.
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