hi as u can see splashing some cash

getting rid of my old pc ive got my trackir 5 pro on the way finally cant wait,and i was just wondering if this new rig set up coming soon would be fine not just for this game,but i am tempted to upgrade the 5450 graphics card if needed if so which one ? also any recomendations on any other upgrades which would be wise for this game wil be taken on board thanks in advance
AMD X2 250 Dual Core 3.0GHz CPU
AsRock N68-S3 UCC Skt AM3 Motherboard
8GB DDR3 1333MHz RAM
1TB SATA II 3GB/s Hard Drive
24x DVD+/- RW Drive
ATi Radeon 1GB 5450 PCI-E Graphics Card - DVI HDMI VGA
300MBPS Wireless PCI Card
ops windows 7 ultamate
OLD DRY PC windows xp,pentium(R) cpu 3.00GHZ/ 2.99ghz,3.25GB RAM/ATI radeon 4800 series