Buy the USD, but against which currency?

I still believe the US dollar will be stronger going forward and I think that its recent weakness presents an excellent buying opportunity. As I wrote in March 2015, there was no reason for the EURUSD exchange rate to go up at that time, unless the Fed would change course and oppose the dollar's strength. Well, that is exactly what happened, unfortunately:

The Federal Reserve has still not hiked rates and some even doubt that it will do so in 2016, while both the ECB and the BoJ have embarrassed themselves by botching up press conferences or entering negative interest rate territory, only to see their currencies go up in value afterwards.

The USD has lost versus most peer currencies, especially the JPY. It's still difficult for me to understand why people have been so concerned about the US economy lately. Every data release that was even slightly below expectations quickly led to more USD selling and EUR or JPY buying. As a result, USDJPY is now fighting not to fall below ¥105 (or even ¥100) while EURUSD recently tried to break above $1.15 (although it has so far failed to do so). The American economy isn't doing that bad, and market participants' obsession with the unemployment rate has reached an outright ridiculous level. At this point it's all about productivity figures!

Anyhow, speculative USD short positions are the highest since 2013. That's a good sign for traders: The extreme EUR & JPY short positions that were the cause of much volatility in 2015 have been reduced substantially, providing new entry opportunities without the risk of extremely sharp moves as in April and December 2015. Market positioning is way more neutral now, which is also a result of investors' inability to interpret central bank actions. Most likely central bankers don't really know what they're doing themselves anymore, so traders are now looking for new reference points that will help them navigate through the muddy waters that are the financial markets. Fundamentals in the US are still better than in Europe and Japan, despite the recent string of disappointing data releases.

But which currency to sell versus the dollar if you share my view? I don't really think the ECB holds much credibility in the markets anymore. Also, Draghi and his team have repeatedly said that they wouldn't introduce new policy measures in the near future because the implemented policy tools needed time to have an effect on the economy. Europe's central bankers are probably too busy discussing their independence from politicians anyway. I expect the EUR to remain range-bound for the time being -- although I must acknowledge that the sideways range in EURUSD has been going on for what looks like a disproportionately long time when comparing it to similar patterns in the exchange rate's history. Be that as it may, the BoJ seems more likely to surprise markets by introducing new easing measures. It is also in a very tricky position now where it has to make decisions within very little room for action around the zero bound. Just how negative can you go, after all? Japan's still fragile economy is in a tough spot here, and I believe both fundamentals and further BoJ actions will reverse the JPY's bout of strength into extended weakness by the end of this year. Conclusion: I'm a USDJPY buyer.