I am trying to make a computer for my whole family. I like to do some minor gaming with steam and everybody else just uses the computer for a lot of web surfing( many browsers and tabs), heavy usage of word and excel(3 pages of each)at a time, so i need a powerful computer and a very stable comp.
The only thing I have against it is the lack of a backplate (I liked the previous A780FullHD better), so if you want to put in a good aftermarket cooler later on be sure to get one with a backplate. You may also want to consider the GXE model for while it does not have ACC it does have CF support (though I guess you won't use that if you just stick with the onboard graphics ^_^) and the standard cheap plastic backplate to help support a decent cooler.
I think you're good to go. You could get a 790GX motherboard for the more powerful IGP and the SB750 southbridge, but that would be about $20 more. You could also get the most powerful discrite GPU you can afford, but that would require increasing your budget as well.