There are plenty of quality products out there. Here are the coils I reccomend.

http://forums.vwvortex.com/zerothread?id=2414043
My friend has these, they have a huge adjustability range which helps with ride quality if you want to go low.

http://forums.vwvortex.com/zerothread?id=3158823
Koni makes quality products.

And KW is expensive but if you can find a good deal they are well worth it.

I definitely reccomend coils because once you start getting your dub low, you will always want to get lower. Esp. when you start hanging out with VW guys.