According to the guys on the Candlepower forums (auto section) aftermarket lights are really poor vs. oem. I'm not sure if the cornerlights would be as much of an issue, however, I bought a used OEM cornerlight off Ebay for $18, to replace a cracked one. It looked better than my other cornerlight.
There recommendation is to find a used headlight, or polish yours. The Doublehorn kit seems to get the most recommendations.
Here is a thread discussing headlight polishing.
http://www.candlepowerforums.com/vb/...d.php?t=266292