The problem with 00 is that it's basically just Code Geass v2.
The other gundams are good, but it depends on what you're wanting. If you want another 00, the only other gundam like it is SEED.
-Honestly I'd just suggest Code Geass.
The only ones that are "recent" are going to be SEED and Unicorn.
-I'm just going to assume you're like everyone and only want after 2007 anime.
And I'm not exactly sure how much you'd get out of Unicorn if you don't know the lore. It's really good but eh....