I thru-hiked the CT last summer, and I wore my windshirt every single morning (and sometimes during the day as well)! A Patagucci Houdini would be fine, but I am a huge fan of the cheapie Chinese windshirts from eBay, because they weigh only about 3 oz, breathe amazingly well, and are remarkably durable. [http://www.ebay.com/itm/New-Women-Girls-Cycling-Coat-Wind-Coat-Rain-Coat-Water-Resistant-Outdoor-Jacket-/161320100242 var=&hash=item258f6d6192:m:mHYfdaqh1CZeNc2XUfz45nA]. I sold my Houdini because I preferred the Chinese ones.
For a rain jacket, you might want to take a look at the new Sierra Designs UL Trench: 9 oz, and the extra length gives more coverage.
Last year was a super el-nino rain year (lucky me <– sarcasm), so nothing was going to keep me perfectly dry all the time. If I were going again, I would take a backpacking umbrella, because weather on the CT is just SO changeable: it sprinkles, then stops, then rains, then stops — so you’re constantly putting on/taking off your pack to put on/remove your rain jacket. Grrrrrrrr. So annoying. If I’d brought my umbrella, I could have avoided about 2/3 of that, because you’re always moving, and passing through various weather systems, often without getting hammered.