Lowering the Ride

[mfo]

Hi guys. I've got a question

I have an opel astra, I'm looking for ways on properly lowering my ride with minimal after effect problems.

So far I've considered

1. Lowering Springs
2. Coil Overs parts for the astra which we dont have here.
3. Putol which is a

Is my number one choice the best amongst the given options? Oww if there is a lowering spring yet would it be compatible with an astra knowing its for a different car. Thanks guys, comments and suggestions would mean alot to me.