the 3000k,6000k ect ect is the color not the output. 3000k is yellow 4000k-5000k is white and 6k+ keeps getting bluer (sp?) 4000k-5000k is ideal for max light output (lumens), most hids kits are 35 watt and blow away halogens ( even silverstars) and a 55 watt kit is better again but washes the color a bit, 6000k might look like a 5000k.after 6000k you are losing light output.
iv had good luck with ddm...but some people dont,you can have 55watt lows , 35 watt fogs, and the error eliminator for about 90 plus shipping. with 55watt low beamns you probably will never use hi beam again.me personally i would go for 5000k low beams and 4500k foglights, most light output without the blue look.