Which vehicle should I buy next for general fun and curiosity?

>The original Oppressor (the gliding motorcycle; not the Mark II hoverbike)
>The Bombushka
>The Stromberg
>The Arena Wars Future Shock ZR380 with the spinning blade or an Arena Wars Cerberus (the only AW car I have is the Dominator)
>Any of the following HSW upgrades: Niobe, Banshee GTS, Stinger TT, or the normal Banshee (I already have the Coureuse, the Hakachou, and the Weaponized Ignus for HSW)
>The riot control truck with the water cannon