I want to use this tie by Drake's - a purple grenadine tie: http://www.drakes-london.com/online-shop/ties/grenadine/untipped-woven-large-knot-grenadine-solid-8cm-silk-tie-5987
I'm also quite bent on using it with my navy suit, but for shirt; white or light blue? I think maybe the light blue is a better match, but my dress shirt is a much better fit than the light blue one. (getting a new light blue from Luxire shortly, but not in time for NYE)
And secondly - can a purple tie be in (relatively) good taste? I bought the tie without really thinking about how to use it, I just loved the shade of purple and the texture of the tie, and as a result I haven't used it once. It's a quite modest purple, but still I often think it's a bit "too much".