Actually I think the new STi is an improvement in looks and usability. I could actually throw a stroller and other kid stuff into the back. It's still ugly, and it took some getting used to, but now I like it more than the previous generation.
I too (being a new parent) like the usability of the new STi...and at first I didn't think it looked that bad...but after watching this : http://www.edmunds.com/insideline/do/VideosGalleryIndex#7
I've decided that it's pretty nasty. (and by nasty, I don't mean I wouldn't buy one as a daily driver...because honestly, if it gets the job done, I don't care what it looks like)
The fact that the GT-R has back seats is attractive to me, since I could have my wife AND kid in the car if need be. Not sure about the stroller...but the trunk looks big enough. The NSX is definitely not a family car. lol