Half of my daily commute is at night. On top of that, half of that is in pitch black darkness. I use the dual minewt setup and even stock, they were more than enough for me. I upgraded the LEDs in my set to the newest, most efficent models(Seoul p4, required soldering 2 points, very easy) and I get roughly 2x more light than stock. This is overkill for commuting and I now run my lights in dim(which is about the same light output as the stock LEDs in bright) most of the time unless I'm showing off. My runtimes have been around 1.5 hour on bright and 3 hours on dim with the stock leds and after my upgrade. I've cycled the battery pack at least 40 times and so far no change in battery life. The battery pack/control unit is very quirky when turning the light on, off or changing to strobe but once the light is on, it stays on. I've ridden through pouring rain with the lights on and they worked like a charm. I'm very pleased with this light setup.

It really depends on your commute which light setup will work best for you. I think a single minewt would be sufficent if your commute is through streets with street lamps. The stock LEDs and reflectors are plenty bright but it doesn't have much of a flood. It's a very bright small circle of light and a lil splash then nothing at all. Dual minewts are nice because you get either twice the light output or ~twice the coverage area depending on how you point them. If your commute takes you through trails, I'd recommend you get a single minewt and a dinotte helmet light.

HIDs and halogen are now relics IMO. The newest seoul p4 and cree xre LEDs are extremely bright and efficent.

edit: It looks like the 2008 model you linked already has either cree or seoul LEDs based on their claim of double the light output. My lights are 2007 models with Luxeon LEDs(stock). Aside from just the raw light output difference, the bright spot on the latest generation LEDs is about twice as big. I'm not sure if they changed the reflectors for 2008.