ceramic pads are fine for rotors, they'll last the longest and dust the least. semi-metallic and metallic pads are the ones with more dust and wear.
That said, just buy any centric OE replacement rotor or any rotor from rockauto or your local autoparts store. This doesn't need to be complicated. Plain 'ole rotor blanks. Splurge if you must, on a painted or coated rotor, where the center hat section is coated to prevent rust.
I really liked the Stoptech slotted rotors that I installed on my 13 ST. They are a quality upgrade from the oem and weren't very expensive. Will be doing the same when the time comes on my 17 ST. They are redily available online.