Please Suggest Upgrades for My PC!

Hi,
My PC is beginning to show its age and can slow down when playing my favourite game at the moment; Battlefield 2, especially when theres lots of action and players! Since Ive got to dismantle my PC to replace the broken chipset fan on my motherboard (again! ) I thought now would be the ideal time to upgrade components. Here are the current specs:
CPU: AMD Athlon 64 FX-57
MOBO: ASUS A8N-SLI Deluxe PCI-Express
GPU: 256MB nVIDIA GeForce 7800 GTX
RAM: 2048MB DDR400 Memory (2x1024MB)
PSU: 550W
AUDIO: CreativeLabs Sound Blaster X-Fi Fatal1ty FPS
HDD: 500GB (2x 250GB RAID0) SATA 7200RPM 16MB Buffer
OS: Windows XP (32 bit)
NET: 2Meg ADSL Broadband (220 KB/second. Ping of about 45-90 on most European servers)
Which upgrades would you recommend? I dont know much about building PCs so replacing the CPU/Motherboard is probably out of the question! So I was thinking the Graphics Card as its easy to install and would this give the best increase in FPS? However, Im a bit out of date with the latest models and which would be compatible with my motherboard and power supply etc? Im on a limited budget of about �130 ($160). I was thinking about the 8800GTS or 9800GT (512MB) or 9600 GT (512MB)? Would this give a significant performance boost?
Alternatively, I could put the money towards upgrading my broadband to try improve my ping?
Thanks.
Answer #1
Graphics Card…
Answer #2
Graphics Card...
Omg you reply quick! Thanks.
Do you have any particular model that you would recommend for my budget, motherboard and power? Sorry if this is a stupid question but are all new graphics cards compatible with mine?
Answer #3
Graphics card and new Internet connection.
Atleast 3MB connection.
Answer #4
nvidia 8800 series are the best as far as I’m concerned…Maybe other people have a different view…
Answer #5
Graphics Card...
The graphics card is everything when it comes to gaming. You can have the worlds best CPU, but if your GPU isn’t as good it means nothing.
Answer #6
nvidia 8800 series are the best as far as I'm concerned...Maybe other people have a different view...
The best for his budget, but there is no doubt that the HD 4870 X2 2GB GDDR5 are the best in the market, as far as I am concerned.
Answer #7
Thanks for the replies guys, you certainly know your stuff!
The video card seems to be the way to go. The 8800GTS (512MB) and the 9800GTX (512MB) seem very similar:
http://www.custompc.co.uk/features/602337/analysis-geforce-9800-gtx-gpu/page1.html
I managed to find a GeForce 9800 GTX+ 512MB for an amazing �134.54:
http://www.novatech.co.uk/novatech/specpage.jsp?NOV-98GTXP
However, it doesnt give details of the power connections. In another review I think it said it needs two 6-Pin PCI-E power connectors (is this the case for all new GFX cards?), but I can only see one in my computer (I unpluged it from my current card so you can see), though there is a spare 4-pin one. I have lots of existing power connections in my PC (2x DVD drives, 2x hard drives, floppy disk drive, soundcard), so would I need to upgrade my PSU as well? Heres some pics from inside my computer so you could advise me what connections I could use. Alternatively recommend a video card that only needs one power cable:

So many wires!
Why is upgrading never easy! Thanks.
Answer #8
To know what slot you have:
1) Go to Device Manager
2) Expand the Display and Adapters by clicking on the little +
3) Spot your current graphics card
4) Right Click it and pick Properties
5) See whats written next to Location:. For example i got PCI bus 0, device 2, function 0 which means my slot is PCI