thanks for all your comments, so interesting.
I was looking at my parents the other day to try and guage what my gray headed future will be like. As I mentioned in the OP, my greys are sparkly silver white.
So looking at my mom who is 70, she is still 99% brunette with about 10-15 white hairs in a tiny puff over her right eyebrow.... so since I have already plucked about 20 greys, I think I'll be more like my dad who started greying in his 50's. He's 75 now and has the softest silvery 'glowy' white hair, it's gorgeous, almost pure white and baby fine. If he let it grow longer, it would be curly too but he's got a cute little wave at the front. So, if I get his greying pattern and his colour pattern, I'll probably be ok with going grey. Just not yet