You may wish to consider KMR. Not only does the size of the Kinder Morgan family of equities make KMR likely able to refinance more easily when needed than the typical AMJ component company, you also avoid the risk of an ETN and have potential favorable tax treatment of dividends.
On favorable tax treatment: KMR pays its dividends in stock. Thus, one incurs no tax until and unless one sells the new stock one gets as the dividend. This is already a great benefit for KMR. If the Bush tax cuts expire, it will be even more impressive of a KMR advantage.
On ETN risk: I am not so bold and inflammatory as to believe JP Morgan Chase will come anywhere close to going broke. But ETNs, especially until Europe gets settled and a less pro-regulaton White House emerges, are likely to be avoided by some super-cautious investors. Investors seeking high income/dividends tend to be more cautious than the average investor, so AMJ may see some disinterest because it is an ETN.
You might note KMR being up 55% in a sideways market yesterday, on volume that was more than double KMR's normal volume. Also, note it was steady to up in the last hour of trading yesterday, a nice daily chart characteristic (contrast SPY yesterday, for instance).
If you profit on KMR, please consider donating some to an effective charity. Best wishes!