I will make my list 8)
Sami's MC1 is first without a shadow of a doubt, this is the most delirious race ever done (in any Mariokart?)

Might well be considering he spent many years perfecting it!

Than comes the incredible BC1 1'28"93 from Armin, that's robotic...
The barrier is close and on such a long course too!!

GV1 3/5 jump from Sami..I know MJ pulled it off first, but Sami claims he did it as well. Hats off, I can not imagine doing a 2/5 jump on GV1 Non NBT let alone 3/5! ???
And I'll mention GV2 as well, 1'02"26 is as consistent as a WR can ever be without jumping platform. I know MJ did 1'02"30 with all laps within 0.04 of the WR non-jump!
I don't know about RR, it's great for sure but I didn't play the course enough to judge it's greatness

Last mention for BC3, where 1'30"72 is a great time considering all the troubles on the course.
I came close to beating it myself, but crashed in the wall in the very last corner

I am forgetting all Sami's MC times, as his MC2, 3 and 4 are beyond belief as well...however I included his MC1 that tops them all!