I am afraid the Geforce 9800GT has only 512Mb VRAM on it.
I am afraid that it will be difficult to pay the game with high graphics settings and many airplanes around you but it will be enough to gain an experience on the graphics, complexity and damage detail.
The Spitfie IIa is a little bit "unrealistc" (the absolute über-plane) most of us know that and we are waiting for it to be fixedin the next updates.
Still nice screenshots! And story to go with it
Some tips:
Disable Anthropomorphic control - it is not working as well as it should
Before starting using Complex Engine Management, look the videos in Youtube explaining how to start an engine (and warm it up before take off). It will spare you endless frustration moments...
~S~