House on the other hand is interesting to me. They have their problems, they tax too much, and they stress the resources of an already hyper extended region but they mean well, and if the Legion weren't around they would probably have the Mojave whipped to peacefulness and safety.
And while its not so obvious that it is working in the Mojave we have plenty of evidence of its large successes (and some failures) from Fallout 2. They represent the ideals (largely) of the old America and are trying to bring civilization back. All the endings are arguably morally ambiguous but which really speaks to you? Personally I either go for NCR or House. I would like to know which ending you guys and gals go for.