You realise you CANNOT add a PC graphics card to a laptop ?
All the best Brett
The OP says in the very first sentence he's looking to build a PC.
To the OP, while not really my area of expertise I can tell you that I run FSX with Aerosoft addons @ 1680 x 1050 everything on high on far less capable hardware than what you have mentioned. Like you I play the vast majority of games on consoles.