I hear two peice rotors can throw off balance and cause vibration but i do not have experiencenwith that.
Honestly the oem akenbono paired with some stoptech powerslot rotors, hawk pads and stainless lines give the brakes a whole new feel with a nicer overall appearance. Not too harsh on the wallet. I got a good deal on the powerslots front and rear and hawk pads from Tunerz store on here. Grabbed the stainless lines at my local shop and the lines made the biggest difference. At the very least get some stainless lines with what ever you get if you don't already have them!
And here's a guy selling oem calipers!
defi guages, calipers, hood struts etc...