Trying to max out FS9 on Win XP 32

Dear fellow simmers,

I have a configuration which I would like to upgrade, but within limits:

- I would like to keep FS9. In understand FSX can do more, but I just have many add-ons for FS9 and prefer to invest in hardware.

- Would also like to keep Win XP 32, as I am deeply in love with Flight1's Piper Meridian.

- Drives, Case, Power Supply are all very nice & high quality, would like to keep them.

What I want to avoid is to spend a lot of money on hardware that is too "strong" or too "modern" for FS9 - in other words, that offers features which are useless looking at FS9s relatively old programming structure.

I wonder if I can get some advice here on a video card which in this sense could be a solution. I would be glad to look into the used market.

I have made a similar posting in the MOBO / CPU section (http://forum.avsim.net/topic/408756-trying-to-max-out-fs9-on-win-xp-32/).

Kind regards,

Holger

P.S.: These are the details for my configuration:

Windows XP Professional 32-bit

Processor
2.40 gigahertz Intel Core 2 Duo
64 kilobyte primary memory cache
4096 kilobyte secondary memory cache
64-bit ready
Multi-core (2 total)
Not hyper-threaded

Main Circuit Board
ASUSTeK Computer INC. P5B-Deluxe Rev 1.xx
Bus Clock: 266 megahertz
BIOS: American Megatrends Inc. 1238 09/30/2008

4 GB DIMM

4 Drives

1 x Radeon X1950 Series

1 x Radeon X1900 Series

Running three monitors, two of them HP L2105tm (but due to XP limitations, only one working as touch screen).

Drives, Case, Power Supply are all very nice & high quality, would like to keep them.

Looking into upgrading the CPU, but that would probably also require a new MB.

Not sure if the Radeons are already max or if I could do better.