For mine, I've been getting good results with Spaz Stix Mirror Chrome:
LINK It's pretty good, but you'll need to apply a clearcoat over it if you plan on handling it a lot.
If you want an even shinier finish, there's also Alsa Corporation's ChromeFX kit:
LINK. It's a silver nitrate deposition system that leaves a thin layer of metal over the whole surface. The kit also includes a clearcoat which you'll need to apply in order to prevent the finish from tarnishing.
Finally, I've also tried Krylon's Looking Glass:
LINK. It's not quite as bright as the other two, but makes a decent finish without a clearcoat.
Here's a pic of the three tests I did:
https://farm6.staticflickr.com/5642/22297073919_8d9dce8397_c.jpg
From left to right, these were finished with ChromeFX, Mirror Chrome, and Looking Glass.
I hope this helps.