I vote for the small things necklace in the slate blue. I have seen similiar necklaces like the first one everywhere for much, much less $$$$. The small things one (although several girls from this forum have it) is not everywhere. It's still fresh.
#2. I think the first one is overpriced and IMO that style is a bit...dated maybe? Or too trendy or something. I just remember those multi-strand illusion necklaces being everywhere last year or the year before. If you like that style you can find a cheaper version. So I say get #2 which is gorgeous and different and if you really like #1 look for a cheaper one elsewhere.
I'd go for #2 in the blue. I think it's much more versatile. I agree that #1 is a bit pricey and I've seen similar stuff for much cheaper. I like it, I just think you'd be better off with the small things one.
I have to go #2. Pick a color that will work well with your wardrobe. I have a red one, which I love, but I don't get to wear it as often as I'd like because the color doesn't compliment a lot of my clothes.