does anyone know the ups and downs for working with certain factions...
i'm starting a new play through and i dont know which faction i am going to work for so i was wandering what stuff do you get for working with each one...
i already know them for the legion but not for mr house or the ncr etc
in the end game could i ultimately work with the boomers or powder gangers to claim hoover damn... i think those two gangs are cool.

The most unbiased ones you'll get are these

NCR- Stretched overly thin, use questionable motives/ But their hearts are in the right place at times.
Legion- Overly brutal, harsh methods/ They have brought alot of safety and law to the lands in their regions.
House- Cold and emotionally distant from the world, uses questionable methods/ Wants to bring around the revival of the progress of humanity.
Yes Man- the game indicates yes Man might take over Vegas/ The good depends on you and how you decide to run Vegas.

Agree'd I hope we don't get into another argument over this Colonel

I can see the good and bad in every faction, but my alliance is with House. Sadly, alot of the case around here seems to be '_____ IS RIGHT AND THE OTHER IS BAD!!!!!!!'

You mean things like safehouses and stuff?

On a psychotic anti faction build.

NCR, loads of access to very good merchants with cut prices, not having most of the wastes out to get you, by far the most side / unmarked quests.
Access to even moderatly anti NCR mini factions despite you rep, back up in NCR areas if needed when your rep is high enough.
Cons none really a few areas willl turn hostile, 4 I think.

Caesars legion;
Pros: A very good supply stash, one unmarked quests for a very good pay out, but requires a load of work and will turn NCR hostile if done right.
Cons: A very large portion of the map become hostile, and you loose access to some of the best merchants, and a ton of quests.

House / yes man, you can stay in the good books of everyone else for most of the time working with these two.

No spoilers here about the other factions I'm afraid.

None psychotic build, no cons if you play smart.

NCR i feel is the most resonable. say for example the BoS situation