Beckett Monthly vs SMR

Hi, I am going to look at a collection this evening that sounds great. The guy has 6 regular issue Mantles, 12 Aarons, Koufax rookie, 8 Mays etc. It sounds like he is using Beckett to value his cards. I don't want to go in with an SMR in hand, so I was wondering what their format is like and how their mint prices correlate to PSA grades?.
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I much prefer vcp over any of the alternatives.
1960 Mantle $350 $600 SMR $465
1961 Mantle $350 $600 SMR $415
1961 Maris $150 $250 SMR $175
I believe these prices are for cards in NrMt condition. If paying full book or top price, you'll need to land 8s to break even or make a little money.