>>60771963
whatever the best currency to metal ratio you can find is, really.
in my case Germany has this portal
https://www.gold.de/aufgeldtabelle/silber/
which may or may not only list the few sites it partners with, but alas, it compares to spot price which is nice.
Just pick from the best option if you don't like the very cheapest (in my case it was often .625 stuff you could get in bulk, it IS cheap and it WAS in circulation for that matter) and invest however much you want to / can afford.
I usually threw 1000€s in whenever I had enough backup FIAT to last me an arbitrary amount of time.
With gold I was a bit pickier.
generally, under spot is good deals.

>>510055866
the choice is yours, with how expensive it already is it'll not make you significant gains (2x would mean another 100k, that won't happen FAST at least) so best you can do is park your still-dollars into anything that keeps value.
You can buy numbers on a graphics card, alternatives include land, houses, honey (doesn't spoil), ammo, guns, or PMs. If you already own land, infrastructure like giant water tanks and filtration etc. could also pay off.
But yeah dollar ain't lookin' too hot, and by extension the other western currencies (all with massive savings in USD) will shit the bag soon (in economic terms, give it 2-5 years).