Welcome to the forum, Alienmare.
Here is a thread about the HID kits:
zerothread/343711
In the FAQ list, you will find other threads about it, I think.
I had a quick look at your ebay links, so I may be wrong, but don't they only sell xenon bulbs? You need the whole kit (bulbs, ballasts, and cables) if you want to move your car to HID.
About HID kits, they are really plug and play. I had put a kit on my wife's car and we just sold it, so I wanted to move the kit on the new car. It took me less than 20 minutes to remove the kit from the sold car, put back the OEM bulbs on the sold car, and install the kit on the new car. What take me the most time was to find a good place to install the ballast in the new car.
I chose to get the 5000K bulbs as I wanted to stay as close as possible as daylight (daylight is from about 4500K cloudy to about 5600K sunny), did not want to be noticeable (white and not blue), and, most important, wanted to get the most output (no filter on the bulbs).
They are at least twice as powerful as OEM bulbs: My wife or I don't want to go back to non HID lights anymore (when we testdrove for the new car, at night, at first, I thought the lights were not on as they were so weak and yellow compare to HID). When we got the new car, that is the first thing my wife ask to change in the car.
As to where to buy, You can have a good kit at
http://www.v-leds.com (I bought my leds overthere, but they sell HID kits too) or at
http://shop.3bspecialties.com/main.sc where I bought my kits, thanks to Venom_Rogue. Both have really great customer service. V-leds is located in Washington state, closer to you, as 3bspecialities is in Florida or Texas.It is about 150-180$ to get a kit from them, shipping included.
BTW, don't need to order the slim ballasts, you have plenty of space for the regular ones in the Rogue.
Hope this help.