Upgrade advice?

[nooBBooze]

So i just wanted to try and see if someone could give me an advice, what hardware thingy i really need to upgrade first for the sake of a better framerate on "high" LOD settings.
current specs:
amd athlon 64 x2 +4200 (2200 ghz max i think :/ )
ati radeon x1650 series
1024 mb ram
250 gig HD and 8g free on the vista partitition.

[Skyline]

I might suggest more ram. With windows vista premium it definately goes over 1 gb. If you plan on running on xp you should be fine.