I'm buying a bare bones XL2 from an online vendor and it only comes with a lense, nothing else. I can't find a viewfinder for less than $900, so I did a search for an XL1 viewfinder and found one for $300. Is every aspect of the XL2 backward compatible with the XL2, including the viewfinder?

I have another question also. I have the opportunity to get a 5.6" LCD for about the same price. Would that be a better choice?