would i be able to switch GPU with a better 1 and witch would be a good choice here is the pc i might buy pc http://www.bestbuy.com/site/olspage...=product&tab=2&id=1203815923971#productdetail and give you thoughts on if its a good pc or not
not that simple - you will need a new power supply as well, and your case might prove a problem with cooling as well - it is rarely wise to buy a PC with a bad GPU knowing you want to upgrade it, it just isn't that simple.