Warranty Help for a non-CPO

I have a new to me 2002 911 C4 Cabrio with 38k miles and i'm looking to protect myself from ridiculous service bills and of course the scary as hell IMS issue.

I have read through more posts about warranty's than i can count but there seems to be a lot of confusion, at least by me.

Can anyone recommend a good warranty and one that will specifically cover the IMS issue if it rears its ugly head?