you'll need the chrome bezel to cover everything. else it will look ugly. that's kind of hard to find. and reflash, like itzeug said.
you can get some sylvania silverstars, their halogen bulbs are pretty damn bright.
or you can get an HID kit and put it in there. cheaper than getting projectors. just aim them real low to avoid blinding people.
another option is to get p46s. it's still a lot, but it's cheaper than brand new OEMs.
if you can, look for a used set of OEMs.