EPD is pretty diversified. You could add other mid-stream baheamoths or ride a few one-trick ponies for a bit of diversification. But which ones and why? Diversification strickly for the sake of diversification is not necessarily a good thing. You should first figure out an investment statagy with a bit of logic...like mainly buying when it is below it's fair value and selling when things don't feel right anymore. If I could turn the clock back, I'd only have bought when the units were a bargin and I would not be concerned at all about chasing diversification. I dumped an MLP on Monday due to the "not feeling right" thing. I liked it for it's diversification when I bought it. I bought more EPD with the money. And I might add a lot more EPD since the cash has piled up and I don't see anything I really want worse then more EPD. In summary, if you find a safe bargin, go for it. If it's not safe, and that is the whole point to this type of investment, pass on it. If you don't see a safe bargin and you need to put some money to work, stick with what you have and buy more of it.