Personally I wouldn't mind -albeit because I'm interested in looking into getting something done too- but I would prefer that my girlfriend was happy with her appearance rather than unhappy with attributes that could easily be 'fixed' (for lack of a better word)
A nose job is completely understandable and personally I would have no problem with it. A boob job though COULD be a turnoff.. natural is always better unless you have unattractive boobs.. like they are really small(a-cup) or sagging.
With the exception of re-constructive surgery, I consider it 'false advertising.' People need to be happy with who they are.
What Girls Said 2
It's only a turn-off if you're not enhancing but detracting from your beauty.
It's such a shame when already pretty girls think they need plastic surgery and look way too fake and even worse as an end result of going under the knife.
You should speak to a plastic surgeon and get their opinion. A good, trusted one who isn't just after your money will give you a realistic answer about your perceived flaws - being your nose and breasts.