Darwin,
Jason has a point- kind of cooking and pot size make a lot of difference in these stoves. The ones you've picked are good stoves so any of them will probably work.
If you only need to boil water for freezer bag meals and the like then the featherfire with it's simmer control is not really needed. The Etowah would be more appropriate for just boiling.
I don't know if you have looked at other stoves, but I would second the Caldera Cone system by TrailDesigns that Chris mentioned above. Very efficient, very stable, good in the wind, and very quick if boiling water is all you are after.
http://www.traildesigns.com/products01.html#caldera
I would also check out the MiniBullDesigns stoves. Tinny makes some great stoves including ones for just boiling water and others for simmering and cooking.
http://minibulldesign.com/mbdstore/index.php?main_page=index&cPath=1&zenid=f32f3228b8a17ef3af84eab9d65acb5b
I would also check out zenstoves.net as a great resource for infomation on all things stoves as Dennis noted.
http://zenstoves.net/
And alcohol stoves are the one area that you, yes you, can actually make a decent working stove with stuff you probably already have in the kitchen. So jump in and try it.
http://jwbasecamp.com/Articles/SuperCat/index.html
http://www.csun.edu/~mjurey/penny.html
(SuperCat and Penny stove URLs to give some examples, many more on zenstoves.net)
Happy Trails,
-Mark