Why not Dunamis? It's double the power of Angra Linnorm. Since you're almost completely recommending only modern armors, the lack of ranged boosting shouldn't be an issue. Also, I think you made a slight typo. The boosters are pets, and their guest counterparts are in the UR GGB Shop.
20k Z-token Packages consist mostly of booster pets and armors. Booster pets will be useful even when you switch armors due to new releases. The armors are mostly unique items with some interesting effects. Devouring Scythe is arguably the best of these since its ability to eat the Cold, which it also stacks, allows it to hit absolutely massive damage numbers. Airenal's Lance is also very powerful as an old-lean Wind nuke, which unfortunately also means it doesn't work with Dunamis.
50k Z-token Packages consist solely of Champion Sets, and while they have fun effects and beautiful artwork, none of them are that strong mechanically. The best set is the Doomlight Set, which is key to the backlash build, the fastest farming build in the game. Unfortunately, Doomlight is rare, and it's also not that usable for those not playing backlash builds.
7.5k Z-token Packages have arguably the most utility. Buffalot, which was already mentioned, is fantastic for all warriors, providing a +105 Str boost at max level that nothing else in-game can really replicate. Una Poca de Gracia provides a similar boost except for Cha, which means it boosts your booster pet and guest. Una Poca is pretty much useful for all builds in the game. Strawberry/Blueberry Shieldcake are charge shields that provide a ton of effects, including an imbue, Celerity, Hypercritical, and a Cha boost. Royal Wedding Cake is the pet version of these shields, and it provides similar but different effects, including Str boost and Celerity. Royal Wedding Cake needs Cha to reach its full use since it's a pet, so it's usually considered inferior to the shields.