What model motherboard do you have? Do you know if it has any on board USB headers, for adding additional USB ports? You will have to check the specifications for each device that you are intending on attaching to your system, and then check the specs on your motherboard to see what your tolerances are.
As for hubs some are better than others, you can look into using powered hubs, but then you have to worry about powering the hub. Most of the hubs I have seen are 5v so you can get away with powering from your power supplies 5v rail, but make sure you know what you are doing. There are also self powered or bus powered hubs that require no additional power supply aside from the USBs power. If you go this route you will have to know what your current draw is and see if your motherboard can hack it.
Again I think we would need more information on what motherboard and processor you intend on using, along with any drives, etc. before starting to guess whether or not either of the power supplies you mentioned would work. Let me know what you have to work with and I will try my best to help you answer your question.
And before DarquePervert tells you, like he told me... SEARCH, Search can be your best friend. I know you will read it all over on here, but seriously I found there was so much information already out there, and most every subject that I can think of there is probably a thread on here for. I hope I can / did help.