Ok so my birthday is coming up next weekend. I have a few gift ideas in mind and the top one on my list is the HD 4870 due to the huge price cut. I currently have an HD 4850 and i thought the upgrade would be well worth it especially with it being only 180 dollars. But my question is it worth going for the 1gb model or the lesser one. And so which card is the most reliable. Note i can't go over 200 dollars on this.