I went for LEDs (similar to the image below) and they were a waste of Time (I had to send them back) they are in fact less brighter than the standard halogen even though they are advertised
as brighter, might have something to do with the design of the headlight in regards to reflection. (Apparently there are some new generation ones that are supposed to be better).
I ended up getting proper Xenon HID headlights and they are the best I have ever got. The brightness is superb and the colour is your pure white with a tinge of blue,
they only take 3-4sec to warm up. Visibility has increased dramatically too they also do not blind oncoming traffic (I had this tested). I know they are not legal but it is
hard to tell you have Xenon HID as they look just light normal halogen bulbs and there is no glaring etc.
The job itself to install them didn't take that long either as they come with all the connectors that you need.