Hi Doubled
I had one mastectomy only and do wear a prosthesis (would look distinctly odd and lop sided otherwise as, like you, I have/had big boobs), but nearly 4 years later have no regrets about not having reconstruction. Hard to tell when it's not you but if I had lost both I suspect I may have made the same decision too.
My decision was partly because I really don't want any more surgery ( I had a year long seroma, which resulted in a number of infections, the last one really serious) and because I don't want any more scars, implants or anything else.
I am comfortable with how I look, so is my husband, and I am not in the habit of stripping off elsewhere (although after cancer treatment, you do get used to stripping off at the drop of a hat!).
My breast surgeon (who would love to do a reconstruction, but has never tried to influence me) says it's not something you need to make a decision on in a hurry, it can be done quite a lot later.
So nota problem if you change your mind in the future. Good luck with whatever you decide.