As long as you are on city water, you should be fine on water supply. If you are on a well, this could be a problem, you would have to do the bucket test to see how much water you have.
In terms of units, any of those companies would be good units to look at. I would suggest going with a tri-plex plunger pump as well. This is going to be the better quality pump. Some other units to look at can be the DeWalt and Simpson models as well.
Thanks,
Pressure Washers Direct