I would stay clear of those cheap kits and get some decent ones (Phillips, Morimoto etc...) you only change your lights every 10 years or whatever so may as well pick something decent but its up to you, most HID kits have a slightly different light and colour output, for example a 6000k HID kit might look slightly different side by side with two different brands. have a look at http://www.theretrofitsource.com for decent brands i bought my Vega Diamond kit from NYTSKY.