I agree with what everyone here has said - invite your parents and let the cards fall where they may!! I firmly believe that the BEST way to show these JW's that life outside the org is not going to kill you...is to be HAPPY! You're getting married, you found someone you love and adore, you are goign to start a family - show your parents that no matter what they say or how their shunning has affected you - you are 'ok' and that your life is happy without the org behind you. Better yet, stick a pic of the 2 of you IN their invitation....so they can SEE your happiness.
On another note...your parents sound similar to mine. About 3 mos ago, after having dealings with me for 10mos straight, my parents forbid me to come to their home any longer, took back my key, and told me NOT to call unless it's a life or death matter. apparently both of them going into the hospital (my dad for a mini stroke and my mom for knee surgery) was not important enough for them to contact me and let me KNOW...guess they figure that it would go against their 'shunning' policy. But I know my parents, they are the most UNHAPPY people I've ever met - and what's ironic is that despite being DF'd and NOT having family support or association - I am STILL happy!