NOW you guys are finally talkin'! Finally got off that damn Mopar 440 kick! 
My own favorite is the '65 & '66 model, but '65 best. I just like that body style better. And I guess I'd take the 396/427 motor over the 409, but that's just me.
Great looking car anyway.
Sorry Ben, but personally, I would probably bleed Mopar, if cut!

But, even though, I'm Mopar, I still respect and give credit to the others.

My own preference, Chevy wise (of the Impalas), would be the 58' (had one) and the 60'- 64' Nothing at all wrong with the 396'427 or 454. I had the 348 in my 58' and i really liked how it performed and always wanted a 62' Impala SS with the 409hp 409/4sp and positrac.
My 2nd preference GM wise, would be a 62' Pontiac Gran Prix w/ the 421 engine. AWESOME car