Tim, I have the stock Mach HID bulbs and didn't bother upgrading those, but I will be putting in a nicer set of high beams.
White wheels > black wheels, IMO. Black is too overdone, and the white makes the whole car pop more. I think I did them near the end of June. My winter set of wheels are stock 16" 05ish wheels painted black, so I'll still have that look for a few months. One day I'd like to have the wheels powdercoated white for a better finish.
BTW, the white is a pain in the arse to keep clean. I go through lots of wheel cleaner, and there is much scrubbing involved.
Mine: 2006 Mazda3 s GT Hatch: 115k, Gray, Manual
Gone: 2002 SVT, #1654
Hers: 2012 Focus Ti Sedan: 55k, SGM, Manual