Ocean forrest is great stuff... but yeah... mxing it with perlite,vermiculite, and coco coir is makes it even better.
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Also... as mentioned, pro-mix is just about as good as it gets for the price... When I had some cash to spend on my fav hobby, I bought some ocean forrest, some happy frog, roots organic, and a bale of promix. I mixed them together and supplemented with extra perlite, coarse vermiculite, coco coir, and a whole slew of supplemental amendments including azomite, cotton seed meal, kelp meal, gypsum, dolomite, hydrated lime, homemade compost and worm castings, mycorrhizae, chicken manure, and expanded clay pellets. Let me tell you... the investment payed off... with properly composed soil... you will only ever have to water your plants.
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For me creating the soil substrate is my favorite part of gardening.
The trick to adding supplements is to use moderation... just a pinch will do