My ratings of the best horses I've seen since I started following racing in the late 70s:

1 Kingston Town 64.0
2 Manikato 63.5
3 Might And Power 63.5
4 Better Loosen Up 63.0
5 Northerly 63.0
6 Sunline 63.0
7 Dulcify 62.5
8 Let's Elope 62.5
9 Super Impose 62.5
10 Vo Rogue 62.5

Just outside my top 10, all rated on 62.0 are:
Lonhro, Bonecrusher, Hareeba, Schillaci, Saintly, Strawberry Road, Beau Zam, Placid Ark, Red Anchor and Octagonal.

By the way, I didn't consider Makybe Diva because she's still racing. Don't know quite where to rate her just yet.