Katz,
You said the project will be shot on the XL2 in HD but does it need to be edited and delivered in HD?
I have the Sony PVM 14M4U that is switchable to 16x9 it works good but as I continue to move in the HD direction I will be looking into LCD's. However, I am still a big fan of CRT's but LCD's and Plasmas are getting much better.
Do you have an HD card? You will need an AJA, Decklink, etc. to feed the monitor.
Royce