Yea, the NECA 1/4 figures are pretty nice for the money. I had a bunch of them at one point, but ended up selling them all. Seen some nice customs, but they just did not do it for me after I got heavier into statues/props.
One other suggestion I would have is the AVPR Wolf diorama, one of the best dios and if you are going to have just one piece, it is a killer display. I have an EX and love it. If you can stretch your budget a bit they usually sell for around $650-750, but once in a while can be found cheaper if you are lucky or don't mind the regular masked only version. It costs about 2x as much as a 1/5 and it smaller, but it does have a lot going for it, especially if you like Aliens too.
One other suggestion I would have is the AVPR Wolf diorama, one of the best dios and if you are going to have just one piece, it is a killer display. I have an EX and love it. If you can stretch your budget a bit they usually sell for around $650-750, but once in a while can be found cheaper if you are lucky or don't mind the regular masked only version. It costs about 2x as much as a 1/5 and it smaller, but it does have a lot going for it, especially if you like Aliens too.