Light and Motion Vega. A little expensive but:

1) Has 4 settings- high will go for about 90 minutes, will sometimes make cars flash their high beams at you, medium is good for around 2-3 hours, low beam about 6-8 hours (my normal setting in town) and flashing mode. I use this mode when I want my friends to think they are being followed by a cop.

When your battery is low, it'll automatically drop down to low beam and the green light at the back will flash at you.

2) Smart charge- I've left it plugged in for months with no apparent loss of battery

3) Solid mount- Plus comes with spare parts to fix the most common problem

4) simple- all sealed. It's heavy but it's basically one solid piece.