PC upgrade

I am considering upgrading to a newer computer. Currently I have a Dell Dimension 4600C. It has a 2.8 GHZ Pentium 4 WITHOUT hyperthreading and 533 FSB. I have 1 GB of SDRAM memory and a 73GB 10000 RPM SATA HD. I use it primary for browsing on the web and Flight simulator.My question is would I notice a noticeable performance increase in FS if I would to upgrade to a machine with the following:1.)a faster processor (3.0 or 3.2) with HT technology 2.)a video card like a NVIDIA 7900 series video card3.)faster RAM4.)Faster front side busI appreciate any and all advice you all might have.Mike