Here is my opinion on this stuff. Like assholes everyone has one so take it for what its worth.
Billet everything is well on its way to to being the next TT2 wheels. I watched this happen in the street rod industry to where every part of the car that could be made billet was then a year later chrome and traditional looking rods took over and made all the billet cars look dated even though they may have only been built a year or two before.
That being said if you still want billet more power to you but a stock looking door handle would be an absolute waste. A polished alumunum part you have to touch every time you open the door is going to be a major PITA trying to keep looking nice unless you put on micro fiber gloves every time you want to get in the car. If you want brushed it will stay looking better longer but you could get the look your after brushing the chrome or strip the chrome only and brush the nickel for a brushed look without the blueness of chrome.
Richard