Hi,   
Am getting ready to start flying A-10 and want to put together a proper system.  Can I use this machine and add a new video card or should I put a machine together from scratch?  Also, where is the best place to buy components from?    
Thanks!   
1 x AMD Phenom II X4 820 / 2.8 GHz ( Quad-Core ) 
RAM	6 GB (installed)  
Hard Drive	1 x 640 GB  
ATI Radeon HD 5450