Those Ings skirts look really fat and bulky. The JDM nissan ones are nicer imo.
I'd sooner go with an aftermarket bumper..The only nice add on valences are ones from Varis...which you'll have a hard time finding since they no longer make them.
Then there's the JUN valences....not super ugly but very expensive.
and the German rear skirt that fits the euro bumper like in OptionZero's sig. btw, is that your car? you should have some FRP replicas made of that skirt...you'd make a killing.