Hi,First of all i consider anything below steady 25FPS is jerky.My current specs:P4 3GHZ 512 DDR333 RAMSGEFORCE FX5200 128MBMSI NEO-2P MOTHERBOARDI get a reasonable FPS even when running at 1280 x 1024 (steady 30fps) in normal conditions ,and tiny stuttersi.e Default aircraft and scenery and Fair weather conditionsAlthough it drops a lot when passing through clouds and in heavy weather and sceneries (10-20fps)and it gets worse when using PMDG737 (which is the only aircraft i fly, and dont want to fly anything else until the release of the B747)i.e i get bouncing FPS (13-24fps),too annoyingI cant afford to get a high end card like 6800 OR X800 , but i can go through GEFORCE 6600 or equivelent ATI card.All i need is to get steady (25-30Fps) when using PMDG737 and heavy weather N.B i dont care for AA or AF (BUT IF AVAILABLE IT'LL BE GREAT)Also i have no problems using low detailed clouds to gain performanceThanks for your time

Ok here i am answering myself!!!!!!!!!!!!!!After a lot of search here is a list of VGAs i can afford,please recommend one of them according to my needs:HIS 9600XT 256MBRAM XFX 6600 256MBRAMXFX 6600 128MBRAMIs there a big difference bet. GEFORCE 6600GT and standard 6600?also is there a difference bet. 128 and 256mb versions?Thanks