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[LiveLife]

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[Veno]

your sig is awesome 
i think i have bigger max settings 
i should check it

[Mythic]

Tick "Force lossless RGB capture" from FRAPS's Movies tab and max out all the image quality settings from nVIDIA/ATi Control Panel (I guess you know how to do this?). Also make sure that SA's own image quality settings are maxed out. That's all I can come up with.

I've never played SA with 1920-resolution but according to this you need to patch the game. Give it a shot.

[FIGHTER]

You need to patch it indeed.

[Rusch69]

You can play SA on FullHD without patching it (wasn't there a problem with v1.0 replays on v1.01/2.0 anyway?).

As alternative you could try the thing NTAuthority posted here (scroll down a bit):
http://www.gtaforums.com/index.php?showtopic=422154&st=20#

ASI loader is required for it, don't forget to back up the .dll files.

Works fine for me on v1.0.

[FELIX]

I got my 1920x1080p Screen. Started GTA SA and was able to choose 1920x1080x32. 

[Labiloute]

I got my 1920x1080p Screen. Started GTA SA and was able to choose 1920x1080x32. 

because you have 1.01 version.

Choose one of them :

http://www.grandtheftauto.fr/downloads/c545,patchs/

GTASA 1.01 was only release to remove the hot coffee mod, and let you choose HDTV resolutions. And for sure some minor corrections.