Dual Monitor for ATI Radeon X1650 not recognised

My Setup: Linux Mint (based on Ubuntu 8.04 Hardy)
Kernel Linux 2.6.24-19-generic
GNOME 2.22.3
Video Card: SAPPHIRE 100198L Radeon X1650 512MB 128-bit GDDR2 AGP 4X/8X
Monitors: Samsung SyncMaster 225BW, widescreen (DVI); NEC MultiSync LCD 1760V (VGA)

I recently installed the OS fresh. The only changes I made are to get the Xserver to work right with the accelerated drivers; I added this to the end of the xorg.conf file (based on Ubuntu forum advise):
-------------------------------------------------
Section "Extensions"
Option "Composite" "disable"
EndSection
-------------------------------------------------

At this point the video card and both monitors work, but are cloned rather than extended.

Proprietary drivers, 3D acceleration, OpenGL Direct Rendering, and Catalyst Control Center are not working. I went to the ATI website and downloaded and installed their packages. Here is a section of my xorg.conf file:
-------------------------------------------------
Section "Device"
 Identifier "Configured Video Device"
 Option "MergedFB" "true"
 Option "MonitorLayout" "LVDS (TMDS), CRT"
 Option "CRT2Hsync" "30-65"
 Option "CRT2VRefresh" "50-75"
 Option "OverlayOnCRTC2" "true"
 Option "CRT2Position" "LeftOf"
 Option "MetaModes" "1280x1024-1280x1024"
 #Option "MergedXineramaCRT2IsScreen0" "true"
EndSection

Section "Monitor"
 Identifier "Configured Monitor"
 Horizsync 28-64 #You may wish to change the values to fit your specific monitor
 Vertrefresh 43-75
EndSection

Section "Screen"
 Identifier "Default Screen"
 Monitor "Configured Monitor"
 Device "Configured Video Device"
EndSection
-------------------------------------------------

Using the rescue auto detect function will break the Xserver on login without the extra section from above. As I have it right now, it works but does not have full functionality (i.e. 3D acceleration, OpenGL Direct Rendering, and extended desktop) and the monitors are still cloned. I would at minimum like the extended desktop, but would also like OpenGL and 3D acceleration.

Thank you in advance for your help!