We adopted, and in a sense we did gender selection that way. My kids are from China, where sex-selective abortion is a huge issue and it's one I've thought about a great deal.
In most situations I would not do it with birth children. I can see it in the case of sex-linked genetic defects, and I would do it in that case.
For just preferring one gender over another, no, I would not do it. For me, I think I would feel it was "playing God." Funny that I wouldn't see it that way in the case of the genetic defects, but I don't. In that situation it seems to me like an appropriate application of God-given technology. In the case of selection for personal preference it seem to me like an abuse of that technology. Please don't anybody try to point out flaws in my logic because I'm leaving myself
but it's honestly how I feel.
I do think it's a personal choice, like much application of technology. For example, I think cosmetic surgery for reasons of vanity is sickening. But if other people want to do that to their bodies, it's not my decision to make.
I don't know what the last question, "Would you support someone close to you, who did it?" really means. If somebody wants to spend this much money on something like that, I guess I think that's their decision to make. Would I spend time commiserating with them about it? No, I wouldn't, and I wouldn't loan them money to do it.