I propose a combination of other suggestions from this discussion ( most close are voretaq7's answervoretaq7's answer and Jeff Atwood's commentJeff Atwood's comment
Keep current the 200 daily reputation cap (for the reasons discussed herediscussed here ).
Introduce total 500 cap per question/answer
Introduce 5 years age limit for upvotes/downvotes to affect reputation.
Introduce new Recent Content reputation leagues( CodeGnome's answerCodeGnome's answer and Chris's suggestionChris's suggestion )
500 cap per question/answer will impact not too many people (and those have relatively high reputation anyway), so it should not be opposed by the community. If I've got 50 up-votes for the answer, I already know, that it is useful, and not interesting too much is the actual number 50 or 80. And I still can get great question/answer badge, when score will be 100.
5 years age limit will not effect anyone(yet), but will slightly reduce disadvantage in reputation of more recent members of the community.