tex115 is there a reason you haven't updated to SP3?
The video card is nice with that much memory, if you can add more system memory do it. It's cheap right now.
That being said there is no guarantee that you will be able to run dreams.
I have a P4 2.6GHz cpu and 2GM memory and a nVidia GeForce FX 5200 with 257MB. Dreams still run very slow for me.