Just a thought on proof sets: Clad proof sets are not as likely to appreciate in value over time. Most are readily available on Ebay for very modest prices. Silver proof set hold and gain value better,
When it comes to ASE's, it's usually better to wait a bit after first released and prices drop a bit. This does not apply to special editions (reverse proof, enhanced, privy marked, etc...) as those sell quickly and increase in cost (sometimes at a phenomenal rate).
https://www.ebay.com/itm/285377196736?hash=item4271ce72c0:g:h2UAAOSwHitkrgkk&amdata=enc%3AAQAIAAAA4JIU9PbRqgiNKNYX8%2B8yA78gxN9fQ2TmnLXpCIh0KQR39nsd679xX9uTAI%2FvT69s8G4HUPvAMuwNvK3SKTK5CCQppZAXHYe%2FjMQ%2FsTraaZe4mEc6U2%2FO%2FAtSQX7ddbdxoXrpOVJkPwb2pVWLOAj292FTvngdvUDVeLk%2Fo5Mw2L1c4bK6MgwJbQEr8ANh7K4zO5z6LE7alu0LMbMteU71EuYV48NWeFfPDwcDuRMReAXtH2CHl79FxYaBsGLTflxhn83I%2FJ9JrUssD0pQffv80thCByc9Lc6UHo%2BtqwBOcISD|tkp%3ABk9SR_ydqJOtYg
Of the 3 generally issued types (bullion, proof, and uncirculated or burnished), the uncirculated or burnished always has the lowest mintage (yet is not the most expensive...weird). Easily identifiable since it has a W mint mark which is missing on the bullion coins.