I have the OEM Hid Hella Philips kit paid $320 but i also retrofitted audi A6 Projectors into my housing.

If you just want hids already retrofitted to your housing specs. go ahead and buy the aftermarket-Just understand that your light output is secondary compared to that of Hella/Philips

6000k 7000k 80000k 100000k Kelvin Rated kits will give you color but can produce unfavorable glare and lower output Compared to the D2S and D2R OEM Applications