As it sits the universal design for a 9007 HID is borked and no one cares enough to fix it. Good reason to avoid HIDs in stock housings. As far as ballast quality, most people here will argue DDM vs VVME. Both will try and point out flaws in someone else's kit. At the end of the day they're both **** and I'd recommend you check out theretrofitsource.com and get the morimoto HID kit. While you're at it buy some MH1's and do a retrofit so don't add to the number of douchebag's on the road with glarey HIDs in stock reflector housings.
HID projectors are meant for HIDs.
Halogen reflector housings are meant for halogens.