At some point Mr Mkt will have a correction but as of (9-19-13) Mr Mkt is displaying 0 technical signals that a correction will commence in the next week or perhaps even 2 weeks.... in fact SPX is not even showing a flattening period in progress.
Being LONG any inverse ETF is therefore DEAD $$ at best and like;y turn into a LOSS for most.
Some negative divergence is possible in the next few months but its wayyyyy 2 EARLY to be on short side