@BigBud this is a very nice coco, you can then just add some perlite to it if you want: https://gthydro.co.za/products/1032-test.html
Buying coco already buffered and ready can often be rather expensive, keep in mind most come from overseas where the soils are made locally. I suspect this is part of why the price is soo high.
Alternatively you can buy 5KG coco bricks, hydrate it and buffer it yourself and it will be much cheaper.
1x 5KG brick should expand to 60L to 80L generally, then if you add perlite it becomes even more.
The PH 200 should be fine, however check to see the pricing on a replacement probe vs a new PH80... Might make more sense to go for the PH80 depending on replacement probe prices .
Tag us in your thread if you need anything