GMROADSTER's stuff is HID, not projector, and I guess it's the only one out there that will give you both low and hi beams in an HID. They are a little "tamer" then others or so I've been told. As far as the LED bulbs, the website I found were as bright as regular bulbs. If I remember correctly they were for BMW, Mercedes, the G8, Corvette and several other models.....with more coming very quickly. That was 3 months ago when I started the fire storm here about HIDs....LOL....
EDIT: Just read your post on gmroadster's HIDs. If you buy projectors, generally all parts you need will be there. There is no need to buy HIDs separately (that I'm aware of...someone correct me if I'm wrong). As far as plug'n'play....sure...to an extent. You will still have to run the power wires and solder them. No HID will be all plug'n'play because of the power they require. You would destroy your wiring harness in your car if it was total plug'n'play because HIDs draw a TON of current even though most are only 35 watts.
Are you proud of me TomatoSoup for my comments???!! LOL....
You are becoming one with the HID universe, grasshopper. (Wax on, wax off.)
Though (sorry) a couple of small corrections

...
It depends where and how you buy your projectors as to whether everything is included. At theretrofitsource, for example, you can buy projectors and/or HID bulbs and/or ballasts (etc) separately, or as a full pick and choose kit.
You are largely correct that no HID will be plug and play (certainly projector ones), but not because it will destroy your wiring. The 35W HIDs
do only draw a constant 35W in use. Problem is they need a surge of power at turn-on which OEM wiring may have too much resistance to supply, so you can end up with flickering as the HIDs aren't able to fire properly.
As for the LED headlight bulbs being as bright, I won't believe it until I see it! There's a HUGE amount of 'marketing' (i.e. lying) that goes on with automotive LEDs. I have found from personal experience that the wattage ratings you see on packages are, let's say, 'exaggerated'. Those high power 7w or 10w LED bulbs are in reality half that (or less) in reality. When they say on the package 'brighter than OEM!' they really mean 'brighter than OEM when the OEM is off'!
Finally, headlight LEDs are impossible (due to physics) to match to the source point of an incandescent bulb. Even more so than HID bulbs. So a LED bulb can never match the focus point of a standard reflector - resulting in poor focus, glare, and lesser projected light.