What kind of hid headlamp should I get?

I have a 2005 Pontiac g6 gt. I can't decide between 6000k and 8000k. I can't decide on smoked out headlights and tail lights or blacked out. I dont want to blind oncoming traffic so im buying the complete kit. I was thinking about this one 05-08 PONTIAC G6 COUPE/SEDAN PROJECTOR HEADLIGHTS+HID http://cgi.ebay.com/ebaymotors/05-08-PONTIAC-G6-COUPE-SEDAN-PROJECTOR-HEADLIGHTS-HID-/330516123852?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A2005|Make%3APontiac|Model%3AG6&hash=item4cf44bd0cc OR 6000K SLIM HID XENON PONTIAC G6 CCFL HALO HEADLIGHT BLK http://cgi.ebay.com/ebaymotors/6000K-SLIM-HID-XENON-PONTIAC-G6-CCFL-HALO-HEADLIGHT-BLK-/190547675241?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A2005|Make%3APontiac|Model%3AG6&hash=item2c5d86c869 What is the difference between the two, which one should i get?