- Weapon: Null-Ray Rifle
The Unicron Trilogy had some nice figures. The Energon and Cyberton lines, in particular, had a lot of really neat homages. I'll list some figures you may want to check out from each line.
Armada: Deluxe Prime, Deluxe Nemesis Prime
Energon: G1 Deco Starscream, Shockwave, Leader Galvatron, Towline, Downshift, Arcee, Insecticon, Scorponok, Rodimus, Mirage
Cybertron: Voyager Starscream, Legends Sunstorm, Leader Prime, Leader Galvatron, Dark Scorponok, Excellion, Soundwave
Universe figures/repaints that use Unicron Trilogy molds: Botcon Bonzaitron, Universe Blades, Universe Springer, Universe Ultra Magnus, Universe Ratbat, Universe Dirge, Universe Superion, Universe Bruticus, Classics Devastator, Transformers the Movie Big Daddy, Botcon Weirdwolf, Universe Target Exclusive Leo Prime, Universe Blaster
Figures that aren't homages, but are still worth owning: Micron Legends Tidal Wave, Energon Scowcat, Energon Perceptor, Cybertron Sideways, Cybertron (or Universe) Vector Prime, Cybertron Shortround, Cybertron Thunderblast, and Universe Dropshot.
I'm not sure if these two guys are being considered, but you should look at Armada Unicron and Cybertron Primus. Those two figures (IMO) are almost essential to any TF collection purely by reason of the Transformers mythos.