What to play? Combat 1-shot

[Eldariel]

If you want potent SR ability combined with amazing LR potential, Bladesinger and Moon Druid are pretty amazing. And they get 3rd level spells for this which is insane (Conjure Animals, Hypnotic Pattern, Fireball, etc.).

Out of those I do like 3rd level spells; both Forge and Tempest Cleric are great. Artillerist and Drunken Master can be a ton of fun too if not quite as powerful. I'm not crazy about the other options but certainly, pick what you most enjoy.

EDIT: For Magic Items, Winged Boots and Sentinel Shield are great uncommons. Simple stat boosters and numeric boosters (Cloak of Protection & al.) are always welcome of course.