I would have to say Matrox since they seem to be shifting towards the business market while ATI and Nvidia are going after the gamers. How a Matrox G450 card with DualHead? Those cards mean business!
http://www.matrox.com/mga/business/home.cfm

With big the fight between ATI and Nvidia, Matrox seems to be overlooked and forgotten. Don't underestimate them, they make good stuff and have been for a long time.