I need a system with 8 monitors.
Each monitor 23 inches (or 24 inches each).
I want to connect them with one computer case(desirible).
Configuration should look like this:

There few options:
1) 2xATI Radeon HD6970(or other ATI card that support ATI Eyefinity with 4xDisplayPort); 8 Monitors with DisplayPort's.
2) Motherboard with 4xPCIe x16 and 4xVideocards in some mode(SLI or Crossfire).
3) Common motherboard(2xPCIe x16 and few PCIe x1); 2xPCIe x16 videocards; 2xPCIe x1 videocars.
4) Using some extenders, like USB to VGA or another (but I need to work with normal resolution without lags).
5) Two computers with 2xVideocars on each; Some device that can to provide functionality that i need (but I need to work with normal resolution without lags).
6) Your suggestions.