If this is what you're looking for, I recommend a Dex-based Gnome Eldritch Knight.
Pros: good AC, good saves from gnome racial + indomitable, resistance to magic from gnome racial, very good chance to pull off surprise nova with invisibility + high dexterity and can action surge to double up on attacks, great initiative, great burst capability from action surge multiple times per short rest.
Additional pros: can multiclass well (especially into wizard for even more spell slots), gets extra feats, has high HP and general defensive capability, starts working before tier 2 of play