That '70 Ryan card was actually the last card I got to complete my 1968-present Topps collection. It is a brutally difficult card to get, being a high number and all. I paid close to 100 bucks for that card, and it is in kinda rough condition.
That said, I had a ton of fun putting those sets together.
The only tougher card from that era is probably the 1967 Tom Seaver card - his rookie, a high number and I am pretty sure it is a short print to boot. In the end, that will probably be one of the last '50s and '60s HOF cards I get a hold of.