The recommend specs for your L1915S LCD monitor is 1280x1024@60Hz
The sync input is hsync 30.0 - 83.0 and vsync 56 -75, so select the Generic LCD Monitor 1280x1024 and make sure your /etc/X11/xorg.conf file has something like;
Code:
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "LCD Panel 1280x1024"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0
Option "dpms"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1280x1024" "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
As far as the "the correct NVIDIA drivers" I cannot say which 'closed source' driver from Nvidia will work. Others have reported problems here at this site, check around and see what advice worked for them. I can tell you want worked with RedHat ES4 may not work with FC5, try visiting the Nvidia site and see if they have updated drivers, also visit
http://rpm.livna.org/ for a possible solution.
A quote from livna.org's site;
Note2: The Nvidia driver currently has a issue with SELinux; see Bug 843