well, first of, let me say that im only 14 so I dont have that much money. and also, I'm using my samsung tv that I just bought. It's connected through HDMI. 1 more thing, I have a radeon HD 5850, but I want to upgrade.
According to Tom's Best Graphics Cards For The Money: February 2011 you should get a Radeon HD 6950 but they don’t recommend upgrading your graphics card unless the replacement card is at least three tiers higher. Otherwise, the upgrade is somewhat parallel and you may not notice a worthwhile difference in performance. Your 5850 is one tier from the 6950 and not far from the top. You should get a 2nd 5850 and run a Crossfire setup if you think you need more performance.
Why is it so important that I get a 1080p monitor? I mean, the graphics look PERFECT on here. Everything looks perfect. AND it's easier for my graphics card to handle. and I honestly don't think that you can tell the difference between 1080p and 720p at 22 inches. even 32. now any bigger, thats a different story. And the reason I have single channel is so that I won't spend so much in the long run. So do you think that I should get some more RAM???
Not necessarily more RAM, just take advantage of the dual channel data throughput by installing a 2 x 2GB set of sticks, it would certainly help overall performance.
And if you really want to stick with 768 then that's fine, i'm not going to stop you, but smaller resolution monitors are prone to aliasing more, to counter this you'll need to push AA higher in games, which is more taxing for your GPU. So it's all swings and balances in the end.
So, at 768, i would suggest something like a 6850 or 6870 if you really want to go overkill.