I have personal experience with the ones I listed. They are very well plated and don't flake as long you don't bash them against anything and use care when putting them on and off. They have gold plated ones also which I think plates better.
2001 ZX3 2.0L Zetec-
Hatch Nation #42
Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)