I need to replace my pretty much bald Toyo Proxes on the front of my Focus. First of all, one of the tyres has worn *alot* on the outside of the tyre... this is on the wheel I knocked into a kerb... I guess this is the tracking that is out and is causing this excessive wear? Second of all, on mytyres.com... they have the Goodyear F1's.... Goodyear Summer tyres EAGLE F1 GS-D3 205/40 R17 80W Goodyear Summer tyres EAGLE F1 GS-D3 205/40 ZR17 84W XL What's the difference and which do I need? And last of all, are these the best tyres I can get for my budget? Cheers.