Not very often do you see such Soviet commemorative presentation sets like these two:

Commemorative 1988 set

Commemorative 1990 set

Much rarer is a complete set of 6, which includes two additional gold coins... but that is already over most of our budget, and perhaps overexaggerated...

Fortunately, silver proof sets, are somewhat difficult to locate but still somewhat affordable...

Wow! Beautiful coins.

The last coin in the first set is 1000 years of silver coin minting in Russia. Very nice coin-on-coin design.