Reverse Proof!? How on Earth have I not heard of those? I LOVE the Eagle coins.
If you want to "collect" coins, seek out older, scarce issues at the highest quality grade you can afford. Contemporary bullion coins are issued in large quantities, virtually all are MS 69 or MS 70, so they have no premium for quality or scarcity.
I like the US and Mexican coins.
Goldbug Ping.