I tried grooved EBC disks on my remapped BMW 330D but hated the noise - eventually settled for plain disks and Tarox Strada pads - very good combo for road use IMOI do not know what is the best front brake disks, but Ford offers the Tarox bake disks for the original brake calipers. I would upgrade the pads at the same time + the brake fluid. It all depends on what kind of usage you are planning to do with your car.
FIESTA TAROX®* FORD PERFORMANCE FRONT BRAKE DISC KIT F2000 MODEL DISCSExplore the official Ford UK catalogue and online shop for accessories, performance parts, service plans and extended warranties, with selected free shipping.shop.ford.co.uk
While Mountune offers lower cost alternative:
Grooved Front Discs [Mk7/8 Fiesta ST]The mountune Fiesta ST front brake disc upgrade features a precision-machined 8-groove design to help deglaze the brake pad face and help promote even pad wear.www.mountunestore.com
They look the same and Mountune's big brake kit uses EBC parts, the alloy bell is clearly marked as EBC and the calipers look very simalar so it's likely these discs are EBC tooAre the Mountune effectively EBC EBC Ultimax Grooved Disc re-badged?