yeah the langster is great but a lot of people on here think steel frames are more comfortable, especially for long distances.
i think you'd be very happy with the langster, but if you can get to a bike shop to try out a steel frame and an aluminum frame, you should go for some test rides to see which you like.
i think being able to ride a bike before you buy it is very valuable.
and you can always get a cushy-comfy seat if the aluminum is too quick for you.
but yeah, i love the langster.