Hmmm, my BEST LIW symptom.... I actually feel like I have passed the excited, giggly, happily waiting stage and am now a mad crazy person!!! Mwah ha ha!!
Some of my symptoms include:
1) Looking through the history on his computer like some sort of detective. Once I got so excited because pricescope was in his history!! Only then I realised it was from when I''d used it... Oh dear...
2) Telling him (in a very loud, carzy person''s voice) about people we know who have got engaged. And then repeating it a further ten times throughout the night, "Did I tell you about Jane and Mark getting engaged??"
3) Running around the living room on Christmas Day (with crazy person-like speed!) Searching for any hint of a ring box. Then almost having a heart attack when I saw one sitting on the sofa, only to discover my dad had sent it with a chocolate from Santa... thanks Dad. Thi also happens on Birthday''s, anniversary''s, Easter, Bonfire Night, Halloween... Yes, I really am going mad.
4) Leaving copies of brochures and catalogues around the house in prime positions (open on ring pages of course.) On the sofa, on his pillow, in the bathroom, next to the microwave.... You know, all the usual places.
5) Checking the answer machine on the phone multiple times, just incase a jewellers have rung tried to contact him (Then sitting like a depressed crazy person because there aren''t any messages.).
6) Replying to a lot of his requests with, "Sorry I can''t, obviously if we were engaged it would be different..."
7) Putting on films that feature proposals/ weddings and then grinning like a mad woman all the way through them to show SO how happy it would make me.

Staring through jewellers windows at happy couples buying rings together (imagine me with crazed, horror type furious face at the wondow because it isn''t happeneing to me yet.)
9) Watching wedding montages/ proposal stories on You Tube and turning the volume up LOUD so SO asks what I''m doing. I then reply, "Oh nothing," but I know that he knows what I''m doing which has enabled me to get weddings into his mind without me actually saying anything. Clever eh?
Anyway, sorry about that but I feel better now!
So in answer to your question, those are my LIW symptoms, but not sure which one you would class as ''best?''
Reading back through those maybe it is apparent why he hasn''t porposed yet.... Ha ha!