I have researched this quite a bit, but have yet to get the funds to make the upgrade. So, take my opinion with a very large grain of salt. :)
From what I've found, e-code is absolutely the way to go. Granted, it's not DOT-approved, but neither are HID swaps, and e-codes are MUCH safer for other drivers if done right. The cut-off, light pattern, and clarity appear to be bar-none. As far as housings, Hellas seem to be the go-to for everybody. After researching Cibie, they seem to be THE top of the line, that hides behind the scenes for true lighting enthusiasts to pick up. So, I would go with: e-codes, Cibie or Hella (that order), and HIGH wattage (80wL/100wH) bulbs.