I would really like them to do as they did with Sims 2 -release a complete edition for free during a few days. But if they would sell it at a complete edition, I would probably not want to pay that much, because I already have most of the expansions (I just don't really have a computer that I could install them on)
The sims 1 Makning Magic - but that could also be because it's so nostalgic to me, because it was the first expansion I got for the sims. The sims 2: University The sims 3: - dunno, I've never played the sims 3 that much The sims 4: Seasons - even though I don't own it (yet), I really like what I've seen of it on You Tube
My big sis had bought the sims 1 base-game and I rarely got to play it. Not so long after that I also found out some friends had it and got to play it a bit more while i was over at their houses, and that was also when I first learned about expansionpacks.