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I was wondering first what does k stand for when it says 3000k HID lights, how high do HID lights go in power, and where is the best place to get them for civics.

 
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K is the kelvin color temperature. all it refers to is the color of light. the higher up the number, the whiter/blue the output is, and the dimmer it gets. 4300K is oem color white and brightest. 6000K is white/blue and much dimmer. check hidplanet.com/forums for more info. other good site for parts and info is theretrofitsource.com

 
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also 6000k 35w has a different color then 6000k 55w . this is the cheapest place to get good quality HIDs.
http://www.ddmtuning.com/

 
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I'm using a 55w ddm tuning slim ballast for my tsx retro right now

edit: come to think of it, I'm using a pair of their 6000k D2S bulbs, too

but to answer other parts of your question, regular ballasts run 35w, but there's also a 55w option (brighter light, runs a tad bit warmer than 35w kits). Non-digital ballasts will have a starting current that will momentarily spike above 15a (i've never tested the current draw, but they would pop my 15a fuses, but swapping for a 20a fuse was fine), but then draw something low (dunno what the value is).

The DDM Tuning digital ballasts I'm using have a starting current of (something along the lines of) 6amps and a normal operating current draw of 3.4amps. I do, however, have a separate relay for the HIDs, drawing power straight from the battery and using the OEM headlight socket to activate the switch.

 
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yeah the relay harness is there to absorb the initial current spike. after they warm up for a minute, they comsume less power than stock halogens (35w instead of 55w). 3amp sounds about right. halogens are around 5amps.

 
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Lol.. when I was young and naive and bought the xtec kit back before Jay (Impulse) because a shitty "vendor", I just swapped my 15a fuses for 20a fuses.. lol