I can attest to VVME had my HID kits from them for about 3-4 years now. DDM is supposedly just as good. I would stick with either one.
I'm actually considering replacing mine at some point in the near future although there is nothing wrong with them. Right now I have two VVME kits that use an older analog ballast and are 35w. I run them off a relay harness for both. It would be nice to upgrade to digital and I would like to find a high/low beam kit for my main headlamps that switch from 35w to 55w when enabling the high beams
I'm pretty sure none of the rangers require an Error Eliminator as they don't have the bulb malfunction indication system that some newer cars have. At least the 2000's dont