So . . . is the oil filter leaking, or is the oil filter housing gasket leaking?
This is that gasket.
http://www.rockauto.com/catalog/moreinfo.php?pk=2653130&cc=1429310
By the way, how bad is the oil situation?
Any spots on the driveway?
Have to top off often?
If that gasket is badly leaking, I might consider getting it replaced and hold off on that rear main seal for now.
If the answer is no to all of the above, I’d be inclined to keep an eye on it for now.