New
#31
As you stated to me, I will say back to you: I respect your opinion. I have no answer as to why your gameplay experience was not up to snuff with a Dx11 game on a 19" monitor with a 5770.
But, the OP is on a budget and the high-end 5800 series card are overkill for a monitor with 1400x900 resolution. And from what I've read, a 5830 might be too much--one, it is stated that the 5830 is longer than a 5850 which doesn't make sense to get if it won't fit in your case (and you're on a budget) and two, it is a 5800 series card which means it would be overkill on a monitor with a lower native resolution.
Basically, if the OP doesn't give a hoot about Dx11, then I agree with your suggestion to get the strongest Dx10 card the OP can afford.