the color thingy is my personal observation and will stick to it.
for exceed... if u r trying for single bulb hid... try to fetch something with has h/l machinical feature. it will save ur cost. anyways u can check the following....
xenon+halogen
xenon (single tube with no high/low function)
bi-xenon (4 bulbs+4 ballasts) most expensive;)
bi-xenon (4 bulbs+2 ballasts) good for vehicles such as new corolla, civic, etc
xenon H/L (2 bulbs+ 2 ballasts) high/low function controlled through motor