Gray I have some Oracal 651 and 751 here just small amounts so I am not an “Oracal user”, but do have about 250 rolls of Avery here, the local oracal guy says that 751 is like Avery 800 and is here about the same price. I would question this as Avery 800 is a cast vinyl and Oracal 651 and 751 are calendered.
Avery’s new 700 series is really nice to work with, and has an extended life over the old 600 series, and early 700 series, I would say looking at the 2 that they are very similar (751 and 700series). I tried to run a 50m 651 through my Edge and succeeded! but prefer printing on Avery 700.
I think Oracal 751 is probably a good one to run with Avery 700, they also do a new cast Oracal 851.
As a side note I was very impressed with what Rob has managed to do with his 751 in different situations like talgates and recesses in pressings.