The most well known ship in the Star Wars Universe, I'm suprised that I can't find complete stats for it. Does anyone know the Speed and Hyperdrive Ratings of an Imperial Star Destroyer?

Its real name is the 'Imperator', not the imperial. Google seems to think it's got a 1x hyperdrive.

I recommend the following three sources:

Source One
Source Two
Source Three

Oogedy boogedy?