4300K will give you the most light output, thats what I have in my Marauder and I would never go higher then 5000K, at first I ordered 6000K, I sent them back because I was getting headache's from the blue light. 4300's are also WAY brighter, but still look slightly blue compared to factory halogen.

 

Ddm's the way to go $55 plus shipping for the dual beam. Ive had mine for a few months now no issues