Time In These Wastes Is Time Well Spent
The GOTY Edition, in my eyes, is the route to go. You get to play this wonderful story from start to finish, seeing all this game has to offer. And last time I checked, it was 25 bucks in my area (a pawn shop), so it was def a good buy! There really isn't too much to say here other than if you are wondering if this game is right for you- buy it. You'll be doing yourself a favor.
I will say this- I liked all of the expansion packs EXCEPT for Mothership Zeta, which, originally, was the one I was amped about. I didn't care for for all the Aliens really had no creativity to them, or diversity. I didn't care to have all the alien drama. It was a wonderful idea, but when pulled off, it sprans an ankle.