Maya, I have been giving this some thought. First, I'm not sure that blue would suit you. I think you need to have cool undertones for blue to work, and from what I have seen of you, you seem to have warmer undertones. I think that blue can look great in black hair, but it tends to look best in people whose hair is already kind of blue-black (mostly women from southeast Asia).
More generally, I'm torn on the whole hair color thing, mostly because it scares me personally, and because I have had less-than-stellar personal experiences. When I was 18 I had my hair highlighted and adored it. I thought it was fantastic. I went back and got it done a second time and came out with orange hair, which literally took me four years to get rid of. Then this summer (as I'm sure you remember, as it happened right before we met), I had my hair colored--for the first time in 14 years. And it was an absolute nightmare. The thing is, I still do have a desire to play around with color, but now I'm terrified (even though I know the exact shade of hair color that looks exactly like my natural color, so bringing me back from a botched job wouldn't even be that difficult).
Part of me wishes I had played more with it when I was younger and didn't have to worry about looking strange in a professional environment, and that part thinks you should go for it. But then another part of me feels that most people are born with their natural hair color because that is what naturally looks best on them. Your hair is so pretty, that I think you're one of those people.
As for the softness, I wouldn't be too concerned about that. A lot of hair color can actually make your hair softer. If you do decide to color, I would consider going to Aveda, because their products do seem to soften the hair (I used to get a clear gloss put on my hair there every once in awhile, and it always felt softer afterward, and my hair is not coarse to begin with.)
All of this is a very long way of saying...I'm not sure. But not blue.