Monitor Resolution

Well any resolution isnt dependent on screen size, so a 1080 P res, will have no impact on performance when being on a 22 inch or a 27 inch. performance will be the same.
Only Resolution as such affects performance.
A 5770 will do good on 1680, for 1080 p a better card is required, but it Will run on 1080 p ..

On a 23 inch monitor at 1080P you will get a sharper image than at 1680x1050 at 22 inches as the PPi will be greater, more pixels per inch. So you will get a sharper picture when sitting closer as most of us do with PC's.
At 27 inches the PPi is noticably less so you could even end up noticing the Pixels if you are sitting too close.

For a PC station scenario where you are close the 23 would give you noticably better image quality than the 27 but if you have roon enough to be about 4-5 foot away from the screen th e27 will be fine as once you get enough distance between you and the screen it will look better. Pretty much the same as teh 23 close up.

Mactronix  

okay thanks.. What kind of card would be a nice upgrade for the 5770.. My monitor is a Samsung 2232 BW what kind of monitor would be an upgrade/.. Im just a gamer and just want the best experience I can for the money...

Whats your monitor res ?
An upgrade to the 5770, well if you desire an upgrade now, then a 6850, 6870 >>

My current monitor res is 1680 x 1050 .. Thanks both of you for replying.. I appreciate all the help.. My PSU is a corsair ^00 or 650 I forget

Alrite at 1680* 1050 your card should be fine , unless you want better performance. As for the screen , a 1080 P screen is full hd, more details can be shown..