After reading your first post, i think youre going to end up with a safe full of guns.
Not sure what the MIM is, but I will look it up. Is the look and pre lock just a personal preference based on appearance? I don't remember now, but I know the lock on my 38 special never bothered me.
I wouldn't buy a K-frame Smith .22 without shooting it first, especially a used one. A lot of the used ones on the market are there because of difficult extraction issues. I finally found a K-22 without any issues, but four others ranged from annoying to nearly impossible.
You said you like the 351 c except it is a 22mag. How about the 43c same gun but in 22lr only.