Totally agree with all in support of this idea - the headlights on my '07 Sprint ST were probably the only thing that frustrated me about the bike.
Fitting an HID kit (35W x 2, plus a 55W high beam) is something I have never regretted, especially coming home on dark back roads at night.
I've attached some photos of the job - far from professional, but has served me well.
The 55W high beam does take a few seconds to warm up, so I confess I've sacrificed the ability to "flash" an idiot in traffic for an awesome range of vision at night. In fact, travelling at 80km/h one night on a backroad in country Australia, that high beam almost certainly saved my wife and I from an accident by picking up an animal on the road a good 150m ahead. With the stock lights we'd have smacked it (or just been travelling slower
I wouldn't use the high beam in the city though - it really would blind oncoming traffic. But the 35Wers are great around town.
Hope that contribution helps anyone considering it. I'm just upset these lights are $70 in America, we pay three times that in Oz! Constantly ripped off Down Under...