I agree with your addition to add a tent wildman, I had done that awhile back. It is worth the weight carried, plus with the tent technology you can get a decent 1 man tent from msr weighing in at 3 lbs. Teslinhiker has the better of the idea with a much cheaper and lighter tent than the MSR. What ever route you go, just make sure it is a good tent. You can't beat the price that Teslinhiker paid.

This was my reasoning for the upgrade:
A tarp under heavy rain and wind you get soaked unless you pretty much roll up in it. Also I was carrying a mosquito net with me to keep the little critters at bay. Then I got paranoid that I would wake up with a rattlesnake using me as a heat blanket because they tend to like to crawl in sleeping bags and blankets to stay warm. So, if you look at the weight of a tarp and mosquito netting, I decided for less than 3 pounds I can have a shelter that will protect me from heavy storm rains, mosquitoes and keeps a barrier from the snakes plus it is quick to set up in a storm, no trees to find like a hammock because it is free standing and no poles I have to make in a storm and attach para-cord to hold down a tarp. I took the tent and put them in a freezer bag and pulled a vacuum on it and it is virtually no room and extremely light and ready when I needed it. Plus you have a floor.

http://cascadedesigns.com/msr/tents/fast-and-light-tents/hubba-hp/product