Can my PC handle the Graphics Card?

Right, down to buisness.
At the moment I am playing clan games (mostly Battlefield 2) on a sub-standard PC.
I recently bought 1gb of memory, and am getting 1 more gb soon (making 2gb).
I also would like a new Graphics Card - I had my eye on the GeForce 7600 GT (AGP as I don't have PCIe)
I have an Intel 2.8ghz Pentium 4 Processor which is resonably good for the game I'm playing.
Now my problem is not the memory, but the Graphics Card (I currently have GeForce 5700 LE which is horrible). This card doesn't even meet the minimum requirements even though I've been playing for 3 months.
I suprised it hasn't melted!
My Pavillon 740a has a small power supply, and I'm not sure if it could take the GeForce card I have my eye on.
Any experts out there - 3 questions:
1. Could it take the GeForce 7600 GT?
2. If it can't would it take a 6800 GTS?
3. If it can't take either, what power output should I get?
If looking to spend less than £80 for both card and power.

Now, when I do have 2gb memory, one of the above Graphics cards and 2.8 ghz Intel Pentium 4 processor, will I finally be able to play BF2 on high settings? Thanks.

Thanks for your time.

thanks for the reply, anyone else have an opinion?

if you have access to another PC somewhere, compare the physical sizes of the PSU's, then if they are the same, get a PSU of about 400W. Get a good quality one and not a no-name PSU, then you should be alright

You could get one of the X1950/1900 series for AGP that will run that pretty well.

I fan BF2 on maxed out settings at 1280x1024 with a X850XT in my old system. I just had a 3.4GHz EE P4 and 2GB Corsair. But yours would run it great with any AGP videocard whether it be a Radeon x1k or GeForce 7x.

i checked out ebay - a sweet £60 for both ($120)