Dimension 4700 video card...

Greetings,

 

I currently have an ATI Radeon X550 256MB DDR2 PCI Express video card and would like to upgrade.  I purchased the  ATI Radeon X1900 XTX 512 MB PCIe Graphics Card.  However, after reading through the forums I discovered that this card is not likely to work with my computer.

 

My System...

Dell Dimension 4700

Microsoft Windows XP Home Edition Version 2002 Service Pack 2

Pentium(R) 4 CPU 2.80Ghz

512MB RAM (ready to install an additional 2GB with new Video Card)

ATI Radeon X550 256MB DDR2 PCI Express Video Card

 

So, what is the absolute best video card I can get for this system?  I use it mainly for online flying using Microsoft Flight Simulator.

 

I'm looking forward to hearing your opinions:)

 

JW