Posted 12 July 2016 - 08:28 PM
As has been noted on one of your other threads, pretty much any current computer (including those with today's integrated graphics systems as long as they include at least tow video output ports) that you buy today will likely be able to drive two monitors for things like word processing, email, browsing the Internet, Excel, watching movies, listening to music. It is only when you get into graphic intensive things (such as gaming, CAD, etc) that you would really need a computer with a much more power dedicated graphics system.
As you asking for recommendations, you would be best to at a minimum specify what your budget is and what specific types of things you will use the computer for, but you may want to look at this post for information that you can supply to help people be in a better position to offer recommendations.
As to sites to use, my preferred site as other have noted is Newegg. I also use Amazon for somethings. I know people who swear by TigerDirect. And of course, you can go directly to manufacturer's sites (Dell, HP, Lenovo, etc) if you want customize your computer (i.e. pick RAM, CPU, etc). I personally have never used any of the custom gaming computer sites as I tend to build my own Windows computers these days.