The best I've found for light recharging is to use plugin-to-recharge lights, then store my bike indoors (including in a garage) and hook up the charger to the light without even removing the light from the bike. It's dead simple (if you don't need to leave your bike outdoors somewhere), and removes almost all worries about the batteries running out on the ride. (Still had batteries go bad over time and run out of total capacity).

If you really want to just throw a boatload of money at the problem ;-), you could get a dynamo front and a dynamo tail light like the Topline Plus. Complete, total, absurd overkill for the cost, but you'd never ever have to worry about battery life again!