I would have no issue with aquiring a pass rusher, though I think we need a wide receiver more.
As much as I believe a good pass rusher would put our defense over the top, we can compensate for the lack of one with our excellent defensive backfield. They give our pass rushers more time to get to the QB. Besides, Rex's defensive philosophy is to pressure the QB. Though sacks are preferable, pressure can be achieved without them, as we saw this past season.