yes the wic 1dsu-t1 would be the card to buy. An external csu/dsu add anothe piece of hardware to the equation thus one more point of failure. We tend to use built in csu/dsu and they have worked very well
Note that there is a new version (v2) of the WIC-1DSU-T1. Its advisable to use a built in CSU/DSU. I have seen failure rates on external boxes more than the internal ones. Also configuration can be done through IOS, compared to using custom cables to access the external CSU/DSU and then configuring it.
Lightning causes lot of damages to CSU/DSU equipments. (not direct hit, but heavy currents induced by lightning). External CSU/DSUs seem to protect the router from getting fried. Compared to that, internal CSU/DSUs will get fried and also fry the router along with it, because they all share the same chassis. This is something that I have seen from my personal experience.
We run external CSUS in our company and they give alot more details than the internals...Additionally when you are dealing with hot-failover between redundant routers, there is no way to use internal CSUS...you have to use something like external Paradyne IMARK 9128 CSUS
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