OP, you might be interested in reading some of these arguments that people had over the different factions. They might help you decide.
http://www.gamesas.com/topic/1374953-mr-house-a-good-guy/
You can start here too: http://www.gamesas.com/topic/1374953-mr-house-a-good-guy/page__view__findpost__p__20806216
http://www.gamesas.com/topic/1372185-what-each-faction-means-for-vegas-and-who-you-support-part-2/
http://www.gamesas.com/topic/1370611-is-mrhouse-the-best-option/page__view__findpost__p__20747911
http://www.gamesas.com/topic/1347915-no-faction-will-restore-the-mojave/
Edit:
I dislike the way NCR acts, it's not to friendly. They say 'Hey, how would you like to be a part of us? We'll tax you of course!
' and if you say no, they come back with a gun. NCR can't accept that there can be independant nations like a House run Vegas. NCR isn't inherently evil, but they arguably do a lot of harm. Hell, they blew up an entire city just to win at Hoover Dam. NCR isn't evil, but it is a wreckless nation. I'd say siding with House but helping NCR at the same time does a lot more good for NCR, as it slaps NCR in the face saying their quasi-Manifest Destiny nature is bringing them nothing but trouble.
This is how I view the NCR as well.
You have to remember, OP, that the NCR is in the Mojave to take advantage of its resources and nothing more. They want the electricity at Hoover Dam, and the money in Vegas, and they don't give a damn who they step on in order to get those things.
House may be a dictator, but at least he uses the Mojave's resources to help the Mojave, and at least he knows what he's doing. The NCR is rather reckless thanks to unintelligent leaders and poorly executed plans.