Why do you 'think' they are warped - the only way to know for sure is to check for disc runout with a DTI gauge. Pads sticking can also cause judder if thats what you have. For Brembo Eurocarparts are as good as anyone especially with the discount offers.
Go for Fiat coupe 20v 304mm discs from MTEC. Drilled and grooved will set you back around 85 quid for and front pair and they’re good and they fit perfectly.