I'm obsessed with the first three movies. I told myself a couple years back that I'd only buy one figure of a character in the same scale. With Alien being my favorite franchise (and Hot Toys finally giving us what we want), I don't think I can resist getting both. Hell, I'd buy an A3 version if there were a Doggy to go along with it.
I do want to comment, however, that I'm not sure what the progression has been sculpt-wise, but if the order of updates goes like this...
...that second sculpt was the best for Weaver's appearance in the first film IMO. Unless the low-angle lighting on the third sculpt is what's throwing me off, but that one looks much more Aliens-y.