Dell Vostro + NVS 285/290 AND 280 PCI? Anybody using?

Anybody using 2 dualhead video cards for 3 or 4 monitors on the Dell Vostro?

Configuration of either:

1. 285x16 + 285x1
2. 290x16 + 290x1
3. 285x16 + 280 PCI
4. 290x16 + 280 PCI

Thanks.