If I wanted to watch some more Gundam, what would be the bare essentials that are must watches? Watching Build Fighters kinda made me want to try and get into Gundam, but there are so many different shows and I hear a lot of them range from mediocre to bad, so I have no idea where to start.
Personally, I would start right at the beginning with Mobile Suit Gundam. However, it can be a little stale, especially being the first one and from the 70s. However, if you can look past that and enjoy it for what it is, it is a nice entry. There are terrific collections of the manga being put out right now in hardcover editions if that is more your speed.
After that, I would either watch ZZ if you want to continue the story or perhaps one of the other stories. Many of the entries such as Gundam 0080, 0083 and 8th MS team take place in the Universal Century timeline, continuing the story of the conflict between Zeon and the Earth Federation after the original series. Each has their own quirks and take on different facets of the story. For example, the original series can make it seem like the principality of Zeon is the villains of the story at first glance, while you can watch something like Gundam 0080 which shows the other side of the story from the perspective of a colony that is one of the ones striving for independence.
If you want a good standalone story, Gundam Wing is ALWAYS a solid choice. G Gundam is a good choice as well if you want a completely over-the-top experience.