Can anyone educate me about Ignition Coils or better yet, the whole ignition system?

I have a Suzuki Vitara JLX and have been hearing a lot about changing my ignition coil. What should I change it to? Where do I get it?

Somebody recommended Jacob's Electronics so I did some research on the net. From the write up I am interested in the Off-Road Package that Jacob's electronics has out together (ULTRA or ULTRA Torquer Coil + Up-Hill Module + Off Road Pack). Does anyone have any experience with this? Is this available locally? Would you know how much?

What other alternatives can you recommed and why?

Too many questions... Sorry. Hope you guys can shed some light on this.

Drive Safe. Always.
Daniel:confused: