Have a look at the Sharp Hercules series (MXM850, MXM950 & MXM1100).
I look after alot of these machines, super reliable, insanely quiet during use, fastest ADF on the market and real easy to service.
You can also setup Tandem Copy/Print mode to share the load of the large jobs across 2 or more machines on the network. Therefore making a big job completed much sooner.
We recently put a MXM1100 into a client's printroom that previously had 2 Sharp ARM700 Dragon's. The Hercules did 1.5mil in the first month alone, and goes perfectly everyday.
My 2 cents.

