Latitude D610 Multi-display problem

I think I'm looking at a driver conflict here.  First system specs (pulled from aida32):

Summary

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  Computer: 
   Operating System   Microsoft Windows XP Professional 
   OS Service Pack   Service Pack 3 
   Internet Explorer   7.0.5730.13 
  
  Motherboard: 
   CPU Type   Mobile Unknown, 1900 MHz (6.5 x 292) 
   Motherboard Name   Dell Inc. Latitude D610 
   Motherboard Chipset   Unknown 
   System Memory   1015 MB 
   BIOS Type   Phoenix (10/02/05) 
   Communication Port   Communications Port (COM1) 
   Communication Port   ECP Printer Port (LPT1) 
  
  Display: 
   Video Adapter   Mobile Intel(R) 915GM/GMS,910GML Express Chipset Family (128 MB) 
   Video Adapter   NVIDIA Quadro NVS 55/280 PCI (64 MB) 
   Video Adapter   NVIDIA Quadro NVS 55/280 PCI (64 MB) 
   3D Accelerator   nVIDIA Quadro NVS 280 PCI 
   Monitor   Plug and Play Monitor [NoDB] (12452HA000903) 
   Monitor   Plug and Play Monitor [NoDB] (12456HA013566) 
  
  Multimedia: 
   Audio Adapter   Intel 82801FB ICH6 - AC'97 Audio Controller 
  
  Storage: 
   Disk Drive   Hitachi HTS541210H9AT00 
   Optical Drive   PBDS DVD+-RW DS-8W1P 
  
  Partitions: 
   C: (NTFS)   56753 MB (34448 MB free) 
  
  Peripherals: 
   USB Device   Dell Wireless 350 Bluetooth Module 
   USB Device   Generic USB Hub 
   USB Device   Generic USB Hub 
   USB Device   USB Composite Device 
   USB Device   USB Human Interface Device 
   USB Device   USB Human Interface Device 
   USB Device   USB Human Interface Device  

There's some debug info available from the same program, but I'll need to parse it to get rid of the unnecessary bits.

Basically what I'm trying to do is run the laptop LCD plus 2 screens from a videocard in a D/Dock.  The onboard video is the Intel 915, the Nvidia Quadro PCI is in the dock.  Newest available Intel and Nvidia drivers are installed.  When I go into the BIOS and tell it to use the docking station card as primary, the 2 screens connected to it work fine, but obviously the onboard LCD is disabled.

When I set the onboard video card as primary in the BIOS, the machine boots with the card in the docking station disabled, "Input not supported" flashing on my external screens.  Going into XP's video properties, I can see the Nvidia card and the screens connected, but when I go to activate them it gives an error saying the driver was designed for an older version of Windows and to install the updated drivers.  (This is obviouly not an accurate error message because they are freshly downloaded from nvidia's website, and the video works fine when using the dock's card as primary)

Going a step further, I then uninstalled the intel graphics drivers.  Reboot, and BAM!  video on three screens.  Only because the Intel drivers aren't installed, the LCD won't go above 640x480 resolution with 4bit color.

I've tried uninstalling both video adapters, reinstalling drivers and rebooting in various combinations over the past few days.  I figured it was related to the Intel drivers in some way, so I tried installing the version from Intel's website (8 whole revisions newer than what Dell offers), but since they're not made by Dell, the Intel installer gives me an error telling me to download the 'approved' drivers from my manufacturer's website.

I've since updated the BIOS, hoping the newest revision would help, but it seemed to do nothing.  Any insight into this problem would be greatly appreciated.  I'm not sure what else to try.