Despite the recommendations here, I've found that the Durex Extra Sensitive aren't very sensitive (I used to use these all the time before I realized that the local pharmacy's selection sucks and there are much better options available on the interwebz).
In my experience the larger condoms (not magnum-types but the ones that are almost balloon shaped and designed to allow for movement inside the condom) are more sensisitve (the downside is that you'll look really strange wearing one). That said, I've found Okamoto Crowns to as sensitive, don't look weird and are therfore my go to.
It's a personal decisions so I'd recommend getting a variety pack, trying a differnt makes and models and making your own decision. Also, I'd recommend checking out Condom Man
on Amazon. A great seller. Super cheap prices for the condoms (e.g. 100 Okamoto Crowns for $13 and free super saver shipping eligible), super cheap shipping, great selection, and offers variety packs in the event you want to do some experimentation. Ordered from him twice and satisified both times.