You are absolutely fine. I have an old Sawtooth Powermac with loads of upgrades, including an ATI Radeon 9000 Pro card. This card comes with both DVI and Apple's now-retired ADC connectors. I'm running TWO flat panel monitors... with VGA connections.
32GB iPad 1 WiFi. 2011 Mac Mini Server (used as a workstation) 2GHz quad-core i7/8GB/1TB, 24" BenQ LCD, 17" NEC LCD, Magic Trackpad. MacBook 2.4GHz Core2 Duo/2GB/200GB/DL-DVDRW. Apple TV 2, 32" flat panel TV, Logitech DiNovo Edge BT keyboard & trackpad. >5TB of FW drives, 16GB iPhone 4S. In memoriam: my Sawtooth "Frankenmac" with upgraded dual 1.3GHz G4/2GB/360GB striped RAID/DVDRW/ATI Radeon 9000 Pro