One thing to be aware of is that all of the cheap 27" monitors I've seen (including the Monoprice one) have a DVI-Dual link cable only. If you have an old Macbook Pro then it will have a port for this built in, modern Macs don't have this and PC's may do.
I tried to skimp and buy a cheap passive Dual-Link DVI - Display Port adaptor but it didn't work so I had to buy an active one. I'm pretty sure that Dual-Link DVI adaptors have to be active and they start at $70 http://www.monoprice.com/products/product.asp?c_id=104&c...