oh another counter-point.

you will definetly save money buying in bulk. not like buying 5 of the same ballast at the same time, but if you know what you want, and you buy it all one time, chances are you will get/find some "custom package" deal and save on the whole package & the shipping. cheaper to get the AC reflector then to get the standard and upgrade later. see what im saying? more $ for you in the long run.