Need advice on my next purchase

Hello,
I just sold my old PIII for $150, so I was thinking on spending that money on upgrading my system which main fault is the graphics card as you can see in the specs below:
P4 2.0 Ghz
512 Mb SDRAM
2 x 40 Gb HDD (1 5400rpm and 1 7200 rpm)
Nvidia TNT2 32 Mb Video Card
With this system I can't run FS2004 with max settings because it'll run on 4 or 5 fps.
So I was wondering would those $150 be best spent on a new card (I was thinking on Ati Radeon 9200 or Nvidia FX5200) or on 512Mb DDR Ram?
I'd like to move from SDRam to DDRam because it's faster but what would make FS run faster, the DDR or a decent video card?
Cheers,
Nuno
I just sold my old PIII for $150, so I was thinking on spending that money on upgrading my system which main fault is the graphics card as you can see in the specs below:
P4 2.0 Ghz
512 Mb SDRAM
2 x 40 Gb HDD (1 5400rpm and 1 7200 rpm)
Nvidia TNT2 32 Mb Video Card
With this system I can't run FS2004 with max settings because it'll run on 4 or 5 fps.
So I was wondering would those $150 be best spent on a new card (I was thinking on Ati Radeon 9200 or Nvidia FX5200) or on 512Mb DDR Ram?
I'd like to move from SDRam to DDRam because it's faster but what would make FS run faster, the DDR or a decent video card?
Cheers,
Nuno