What would be the best graphics card for the money?

I am building a computer and I cannot decide which graphics card to get. So far it looks like everything is pointing towards the geforce over radeon. I was originally looking at getting an ati radeon x1900 xtx, but pushed more towards the geforce 7900 gtx. Then, I have also been reading about the new DirectX 10 coming out soon. I need a graphics card so I am not sure whether to get a decent cheaper card for now and then buy later or just buy a good one now. I was even debating getting a good graphics card now and then buying a good graphics card later that supports DirectX 10 (Would they be campatible and work together?) What should I get? I dont mind getting a good graphics card right now, if it is worth it. I will have the asus m2n32-sli deluxe motherboard running an AMD 4600 processor. I am planning on doing serious film editing and possible gaming.