While another pass rusher besides AD and Floyd is important, the Rams have been consistently good at the pass rush with a mixed bag of complimentary players. Another stud would certainly elevate the defense to another level and in that I concur.
However, even "can't miss" prospects like Clowney are not guaranteed solutions and as zn has indicated, that investment beyond the first round is iffy at best.
This returns me to my objection to Bonifay's (an excellent poster BTW) assertion. An offense that can't block the pass rush is even more debilitating than a defense that struggles in that regard. This is why I believe the OLine must be the first and primary focus over the next two years.