It's not unheard of for an investment portfolio to contain 15% (+/-) of precious metals. While "sovereign" coins are great for government guaranteed bullion, private bullion offers a wider variety of uniquely designed bullion for those investors who also happen to be collectors. Bottom line...doesn't hurt to diversify. I lean heavy on the hand poured silver because to me a lot of it's value is in the fact that it's all a work of art by an individual craftsman or woman that will gain more value as time goes by like old, original paintings. That being said, I still enjoy owning Silver Eagles, Kooks, Prospectors, Morgans and many others. 1 Troy Oz of fine silver is 1 Troy Oz of fine silver after all.
Just don't be afraid to jump in with a little of this and a little of that. If you purchase something that after all doesn't quite "ring your bell", then hold until price is right and sell it and get something else. The satisfaction is not only in the having, but in the looking and buying. That's why the "Joy of the Journey is in the Ride"!