The new Epson Pro Z series features great brightness and contrast ratio, 6 axis color adjustment, as well as some impressive edge blending technology to put multiple projectors side by side. I saw this demonstrated and was really impressed. They also offer split screen presentation, multiple PC presentation wirelessly (up to 4 systems simultaneously which could be good in a collaborative lab) and wireless connectivity with the iPhone/iPad. Their prices range from around $10k to just under $20k for the new models.
The xMac™ Mini Server from Sonnet can transform a Mac mini Server with Thunderbolt Technology into an Enterprise Class Rack Mount Server by providing PCIe 2.0 expansion system in a 1U rackmount enclosure. delivers strategic airflow cooling. It features two PCIe 2.0 expansion slots (with a 100W power supply and fans) that connect to the Mac mini via its Thunderbolt port, a central power hub for the Mac mini and PCIe cards, an additional Thunderbolt port for daisy chaining to other Thunderbolt devices. The xMac mini Server even provides a front panel USB port and a power button. The PCIe expansion slots power on and off in unison with the Mac mini.