The Quadro is overkill for 2D work, that's a workstation-class 3D rendering card. Matrox makes the best 2D multi-monitor cards out there. Matrox has a line made for financial markets, they even make cards that drive 4 monitors for places like stock trading floors where space matters. Their multimonitor drivers are also rock solid stable.
If your needs are only 2 monitors, you can get G400, G450 or G550 AGP cards for really cheap at computer shows and eBay. For PCIexpress you'd have to buy new, although PCI cards would perform just fine as well.
Get a good quality reliable PSU like Antec, Enermax, or PC Power and Cooling as well.