It's in my sig; it's my most built airplane; it's Mk I Spitfire.
Pure lines before all the added (but needed) cannons, rearview mirror, armored windshield, clipped wings, etc.
I like the A-26 as an awesome twin. The Mosquito is just too graceful and clean. I'm thinking the Mossie in the beautiful category. The A-26 got them turrets. Would the F7F count or too late?
Honorable Mention: T Bolt's twin engine P-40.