Hey local boy.
I don't think its a matter of how big a drop, as with the 1.4's, standard suspensions varied as to where they sat from the many I've seen.
To be perfectly happy with a drop, get an adjustable susp. Most after sales suspensions were designed for the GTI's, so with less weight up front, it's not gona b perfect. I think with some adjustables, you can change damper settings too, which would mean just tinkering with heights and stiffness until happy.
That way, it gives you the option of height alround, so you can adjust until you're happy, rather than taking a gamble. That's what I'd do if I still had my 1.4, or even with my current car.