I'm wanting to upgrade my rear speakers and trying to get a few opinions from everyone to see which kind of speakers would be a go to be able to work with my amp without messing up or cutting off and all that good suff

2001 jaguar class S 3.0 premiun sound system

 

measure the impedence of the factory speaker than go from there. Hertz makes some really good sets, pricier than normal run of the mill stuff, but the warranty and sound is not run of the mill at all.