The previous comments about native resolution for an LCD are correct, I am sure 1024x768 is the native resolution, so you wouldn't want to/couldn't go higher.
As far as 1024x768 being enough, thats all up to your opinion. I think 1024x768 looks dumb on a 19" monitor, so I run 1280x1024. As for my laptop, it looks best at 1920x1200. (WUXGA)
Desktop machine: 2 x Opteron 246, Asus K8N-DL, 2GB PC3200 ECC Reg., XFX GeForce 6600GT, 74gb WD Raptor, 2 x 19\" LCDs, Windows XP x64
Server machine: Intel P4 3.0GHz 2MB EM64T, ECS i865pe, 1GB PC3200, 36gb WD Raptor, Windows Server 2003
Laptop: Dell Inspiron 9100 (Intel P4 3.2GHz 1MB Prescott, i865pe, 512MB PC3200, Mobility Radeon 9700, DVD+R/DL Burner), Windows XP
Linux: P3 450Mhz, 386MB ram, Slackware 10.1 (Running mySQL/Apache)