so a uncle is gifting me the ability to build a gaming PC and my price range is at or under $900. i know nothing of the components but i do know how to put it all together. so my question is what are the best things I can get in my price range? I would like it to be able to connect to at least 3 monitors and be able to handle anything steam would let me play. picture quality is very important as is overall functionality. I would like to use solidworks and autocad on it without problems and would really like the ability to stream video while also surfing the net. any help would be great and any great helper might get reddit gold or lots of karma.

fiy- i already have all the monitors and the ability to get windows7.

[edit] also i would like to avoid overclocking

also i would like to use an SSD for booting and a regular HHD for storage.