I actually think that the stock projectors on my SSV are the best factory headlights I have ever known / used. The high beam have great output IMO.
Having said that, i have a HID kit in the spot lights of my 4x4 with 8000K 35w globes, they are pencil focus and throw the usable light over 2km, I seem to have jagged it with the spots I put them in for the perfect focal length. So of course when I got the SSV I considered a conversion kit, but on reading into it it seems the biggest problem really is that the UV they produce kills the factory lenses, and given they 'aint cheap, I decided against it.
What I did do, is have the fog lights re wired to be spot lights that only come on with the high beam and used an ebay drop in replacement HID in them. No chance of damage, nor getting pinged by the coppers, and looks factory from the front with no external mod needed. A much better option for me, who does a lot of night country driving.
I have a Great White 12 LED light bar on my truck, it is almost equal in light output to the HIDs on my 4x4, I was considering installing one of these behind the bottom grill in the SSV, again would be largely unnoticed, but have massive forward light output, but really CBF when what I have now is doing the job well.