Use ngk plugs. Yes you can get them at autozone. Platinum or iridium. Doesn't really matter which. Just up to how much you want to spend and how long you want them to last.

 

Your main issue is the car vibrating at stop and above 40mph, I have no idea why spark plug and ignition coil have anything to do with the vibration. I would start with the engine mount, could be a crack or something is loose.

If your G is a AT open the hood stand back have a friend or wife put it in drive (D) one foot on the brake pedal then press the gas pedal to about 6000 rpm and see if your engine shake around.

My brother had me do this to every used car that he wanted to buy and 30% of the time the engine shake around. Hope this help.

 

Thanks!

How about these
Ngk Ix Iridium/Spark Plug

Ngk Laser Dbl Plat/Spark Plug

 

Which one I should go.

PSrice doesn't matters.