I'd like to add 2 SGC 40 t205, 206, 207 to my Phillies collection a month. I'd also like to stop each month once I get the two and wait till the next month

I'd like to add to my PSA7 topps 1960 set, and bang out a good number of the easy ones. I am sending 200+ ttm topps heritage and chicle cards out and I hope to get a 30% return.
I also plan to thin my modern collection out. I feel more connected to my vintage cards and they simply just make me happier.