I have the '07 Langster (not the Comp), I use it as my Washington DC commuter, and I am perfectly happy with it. Like the OP, I also have a racing background from long ago, and with enough experience on road, mountain, cyclocross, and even track bikes, I can tell you that the Langster has a durable, comfortable, and snappy ride. It's easy to control, it's perfect for tooling around for fun, and it's also great for commutes that range anywhere from a leisurely spin to an all-out training ride. From what it sounds like, you won't be missing out by getting the standard Langster over the Comp.

One thing I would reccomend is using the freewheel side and the brakes before you think about riding fixed. Fixed is not for everyone, and it is not for every commute. Riding freewheel on the Langster is insane amounts of fun. Also, don't be discouraged by the wheels. An Alex R500 wheelset is not a Mavic Kyserium wheelset, but on a sub-$700 bike, they are light enough and strong enough to make the rides fun and make the rides last.

Yeah, I was a skeptic also, but now I can say without doubt that I am perfectly pleased with my Langster purchase.