headlight bulbs for 08' Silverado

i was wondering what are the best headlight bulbs for my 2008 Silverado? i was wanting some that have the HID look to them. i know that silverstar ultras are real good bulbs because i have those in my S10 but i've seen some other bulbs that are a little bit blue-er. how about these? any recomendations?  

http://cgi.ebay.com/ebaymotors/_Car-Truck-Parts-Accessories__XENON-HID-HEADLIGHT-2007-2008-2009-CHEVY-SILVERADO_W0QQitemZ330302622410QQadiZ2865QQadnZCarQ20Q26Q20TruckQ20PartsQ20Q26Q20AccessoriesQQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item330302622410&_trksid=p4506.c0.m245&_trkparms=72%3A543%7C65%3A12%7C39%3A1%7C240%3A1318